| Rank | Czech as First Ancestry Population Percentage ▼ | School District / Population |
| 1. | 20.8% | North Tama County Community School District / 2,963 |
| 2. | 18.2% | Turkey Valley Community School District / 3,003 |
| 3. | 16.3% | South Winneshiek Community School District / 4,441 |
| 4. | 16.1% | Belle Plaine Community School District / 3,384 |
| 5. | 13.6% | Central City Community School District / 2,882 |
| 6. | 13.3% | South Tama County Community School District / 8,840 |
| 7. | 12.9% | Howard-Winneshiek Community School District / 8,921 |
| 8. | 12.1% | Alburnett Community School District / 3,463 |
| 9. | 12.1% | Diagonal Community School District / 640 |
| 10. | 12.0% | College Community School District / 22,806 |
| 11. | 11.1% | Mount Vernon Community School District / 5,905 |
| 12. | 10.0% | H-L-V Community School District / 1,957 |
| 13. | 9.9% | Clear Creek-Amana Community School District / 11,173 |
| 14. | 9.8% | Benton Community School District / 9,232 |
| 15. | 8.8% | Solon Community School District / 5,884 |
| 16. | 8.7% | Center Point-Urbana Community School District / 5,870 |
| 17. | 8.6% | Midland Community School District / 3,911 |
| 18. | 8.0% | Cedar Rapids Community School District / 119,132 |
| 19. | 7.6% | Clearfield Community School District / 603 |
| 20. | 7.5% | Lisbon Community School District / 2,903 |
| 21. | 7.1% | Brooklyn-Guernsey-Malcom Community School District / 3,273 |
| 22. | 7.1% | GMG Community School District / 1,889 |
| 23. | 7.0% | Prescott Community School District / 582 |
| 24. | 6.7% | Lone Tree Community School District / 2,954 |
| 25. | 6.7% | Linn-Mar Community School District / 34,836 |
| 26. | 6.6% | West Branch Community School District / 4,223 |
| 27. | 6.6% | Garner-Hayfield Community School District / 3,973 |
| 28. | 6.5% | Riceville Community School District / 2,749 |
| 29. | 6.2% | Highland Community School District / 3,543 |
| 30. | 6.1% | Springville Community School District / 2,550 |
| 31. | 6.0% | Anamosa Community School District / 9,405 |
| 32. | 6.0% | North Linn Community School District / 3,579 |
| 33. | 5.6% | Wilton Community School District / 4,321 |
| 34. | 5.6% | Glenwood Community School District / 11,095 |
| 35. | 5.6% | Pocahontas Area Community School District / 3,611 |
| 36. | 5.6% | Vinton-Shellsburg Community School District / 10,546 |
| 37. | 5.3% | Tipton Community School District / 5,302 |
| 38. | 5.2% | MFL MarMac Community School District / 5,721 |
| 39. | 5.1% | Iowa Valley Community School District / 3,379 |
| 40. | 5.0% | Nishna Valley Community School District / 1,463 |
| 41. | 4.8% | Missouri Valley Community School District / 5,091 |
| 42. | 4.8% | BCLUW Community School District / 3,462 |
| 43. | 4.8% | New Hampton Community School District / 7,563 |
| 44. | 4.7% | Fredericksburg Community School District / 1,624 |
| 45. | 4.5% | Pomeroy-Palmer Community School District / 1,376 |
| 46. | 4.5% | East Marshall Community School District / 3,787 |
| 47. | 4.5% | Fort Dodge Community School District / 30,009 |
| 48. | 4.4% | Olin Consolidated School District / 1,443 |
| 49. | 4.4% | Union Community School District / 6,584 |
| 50. | 4.3% | North Central Community School District / 3,176 |
| 51. | 4.2% | North Cedar Community School District / 5,206 |
| 51. | 4.2% | Keota Community School District / 2,175 |
| 53. | 4.1% | Williamsburg Community School District / 6,177 |
| 54. | 4.1% | Marion Independent School District / 11,774 |
| 55. | 3.9% | Woodbine Community School District / 2,528 |
| 56. | 3.8% | Lewis Central Community School District / 14,945 |
| 57. | 3.8% | Forest City Community School District / 6,622 |
| 58. | 3.7% | Iowa City Community School District / 103,013 |
| 59. | 3.7% | A-H-S-T Community School District / 3,613 |
| 60. | 3.6% | West Hancock Community School District / 3,991 |
| 61. | 3.6% | Iowa Falls Community School District / 6,964 |
| 62. | 3.5% | Ventura Community School District / 1,736 |
| 63. | 3.5% | West Monona Community School District / 4,504 |
| 64. | 3.4% | North Winneshiek Community School District / 1,943 |
| 65. | 3.4% | Grundy Center Community School District / 3,694 |
| 65. | 3.4% | Clear Lake Community School District / 8,681 |
| 67. | 3.4% | Monticello Community School District / 6,594 |
| 68. | 3.4% | Sergeant Bluff-Luton Community School District / 5,921 |
| 69. | 3.3% | Sumner Community School District / 3,065 |
| 70. | 3.1% | Central Community School District / 3,730 |
| 71. | 3.1% | Manson Northwest Webster Community School District / 4,006 |
| 72. | 3.1% | Fremont-Mills Community School District / 2,815 |
| 73. | 3.1% | Graettinger Community School District / 1,480 |
| 74. | 3.1% | Nodaway Valley Community School District / 4,425 |
| 75. | 3.0% | Logan-Magnolia Community School District / 3,332 |
| 76. | 3.0% | Washington Community School District / 10,011 |
| 76. | 3.0% | Osage Community School District / 5,907 |
| 78. | 3.0% | Creston Community School District / 9,311 |
| 79. | 2.9% | Eldora-New Providence Community School District / 3,929 |
| 79. | 2.9% | Decorah Community School District / 11,827 |
| 81. | 2.9% | Winterset Community School District / 8,960 |
| 82. | 2.9% | Whiting Community School District / 1,028 |
| 83. | 2.9% | Anita Community School District / 1,888 |
| 84. | 2.8% | Mason City Community School District / 29,225 |
| 85. | 2.8% | Tripoli Community School District / 2,649 |
| 86. | 2.8% | Laurens-Marathon Community School District / 2,295 |
| 87. | 2.7% | Ar-We-Va Community School District / 2,120 |
| 88. | 2.7% | Gladbrook-Reinbeck Community School District / 4,780 |
| 89. | 2.7% | Madrid Community School District / 3,416 |
| 90. | 2.7% | West Harrison Community School District / 2,989 |
| 90. | 2.7% | Montezuma Community School District / 3,616 |
| 92. | 2.6% | Delwood Community School District / 1,269 |
| 93. | 2.6% | Mid-Prairie Community School District / 9,399 |
| 94. | 2.5% | Malvern Community School District / 2,029 |
| 95. | 2.5% | Marshalltown Community School District / 30,335 |
| 96. | 2.5% | New London Community School District / 2,964 |
| 97. | 2.4% | Northwood-Kensett Community School District / 3,109 |
| 98. | 2.4% | Independence Community School District / 9,560 |
| 99. | 2.4% | English Valleys Community School District / 2,946 |
| 100. | 2.4% | East Buchanan Community School District / 2,950 |
| 100. | 2.4% | Orient-Macksburg Community School District / 1,155 |
| 102. | 2.3% | Earlham Community School District / 3,305 |
| 103. | 2.3% | Nevada Community School District / 8,165 |
| 104. | 2.3% | Underwood Community School District / 3,721 |
| 105. | 2.3% | Hudson Community School District / 3,519 |
| 106. | 2.3% | West Central Community School District / 1,835 |
| 107. | 2.3% | Woden-Crystal Lake Community School District / 836 |
| 108. | 2.2% | Paton-Churdan Community School District / 1,165 |
| 108. | 2.2% | Ames Community School District / 55,030 |
| 110. | 2.2% | Gilmore City-Bradgate Community School District / 980 |
| 111. | 2.2% | Dows Community School District / 1,050 |
| 111. | 2.2% | Lenox Community School District / 1,857 |
| 113. | 2.2% | West Bend-Mallard Community School District / 1,958 |
| 113. | 2.2% | Nora Springs-Rock Falls Community School District / 2,515 |
| 115. | 2.2% | Cedar Falls Community School District / 39,480 |
| 116. | 2.1% | Janesville Consolidated School District / 2,500 |
| 117. | 2.1% | Denison Community School District / 10,321 |
| 118. | 2.1% | Prairie Valley Community School District / 3,719 |
| 119. | 2.0% | Bondurant-Farrar Community School District / 5,772 |
| 120. | 2.0% | Boone Community School District / 14,492 |
| 120. | 2.0% | Webster City Community School District / 10,032 |
| 122. | 2.0% | Waterloo Community School District / 77,311 |
| 123. | 2.0% | Charles City Community School District / 11,277 |
| 124. | 2.0% | Cherokee Community School District / 6,347 |
| 125. | 1.9% | Johnston Community School District / 28,700 |
| 126. | 1.9% | Moravia Community School District / 2,177 |
| 127. | 1.9% | North Polk Community School District / 6,046 |
| 127. | 1.9% | Urbandale Community School District / 20,814 |
| 127. | 1.9% | Clayton Ridge Community School District / 4,896 |
| 130. | 1.9% | Norwalk Community School District / 10,626 |
| 130. | 1.9% | West Liberty Community School District / 6,222 |
| 132. | 1.9% | St. Ansgar Community School District / 4,081 |
| 133. | 1.9% | North Scott Community School District / 14,717 |
| 133. | 1.9% | Dallas Center-Grimes Community School District / 9,890 |
| 135. | 1.8% | C and M Community School District / 1,329 |
| 136. | 1.8% | Centerville Community School District / 9,042 |
| 137. | 1.8% | Gilbert Community School District / 6,065 |
| 137. | 1.8% | United Community School District / 1,814 |
| 139. | 1.8% | Ankeny Community School District / 46,304 |
| 140. | 1.8% | Bellevue Community School District / 4,643 |
| 141. | 1.7% | Corwith-Wesley Community School District / 1,119 |
| 142. | 1.7% | Humboldt Community School District / 7,479 |
| 143. | 1.7% | Carlisle Community School District / 7,808 |
| 143. | 1.7% | Sidney Community School District / 1,666 |
| 145. | 1.7% | Waverly-Shell Rock Community School District / 13,371 |
| 145. | 1.7% | Stanton Community School District / 1,119 |
| 145. | 1.7% | Grinnell-Newburg Community School District / 12,284 |
| 148. | 1.7% | Roland-Story Community School District / 5,945 |
| 149. | 1.7% | AGWSR Community School District / 4,360 |
| 150. | 1.6% | Waukee Community School District / 32,882 |
| 151. | 1.6% | Waco Community School District / 2,958 |
| 152. | 1.6% | Belmond-Klemme Community School District / 4,493 |
| 153. | 1.6% | Pleasant Valley Community School District / 19,928 |
| 154. | 1.6% | Clarion-Goldfield Community School District / 5,091 |
| 155. | 1.5% | Fairfield Community School District / 15,124 |
| 155. | 1.5% | Emmetsburg Community School District / 5,002 |
| 157. | 1.5% | Ballard Community School District / 7,106 |
| 158. | 1.5% | West Sioux Community School District / 4,455 |
| 159. | 1.5% | Southeast Webster-Grand Community School District / 3,547 |
| 160. | 1.5% | Allison-Bristow Community School District / 1,840 |
| 160. | 1.5% | Morning Sun Community School District / 1,642 |
| 162. | 1.5% | Murray Community School District / 1,482 |
| 162. | 1.5% | Sheffield Chapin Meservey Thornton Community School District / 3,025 |
| 164. | 1.4% | Woodbury Central Community School District / 2,836 |
| 165. | 1.4% | Allamakee Community School District / 9,033 |
| 165. | 1.4% | Greene Community School District / 2,165 |
| 165. | 1.4% | Jefferson-Scranton Community School District / 6,408 |
| 165. | 1.4% | North Mahaska Community School District / 2,951 |
| 169. | 1.4% | Terril Community School District / 1,015 |
| 170. | 1.4% | Pella Community School District / 15,598 |
| 170. | 1.4% | West Delaware County Community School District / 9,382 |
| 170. | 1.4% | Baxter Community School District / 1,929 |
| 173. | 1.4% | Ogden Community School District / 4,145 |
| 174. | 1.4% | Lynnville-Sully Community School District / 3,134 |
| 174. | 1.4% | Oelwein Community School District / 9,451 |
| 174. | 1.4% | Carroll Community School District / 14,260 |
| 177. | 1.4% | West Marshall Community School District / 4,347 |
| 178. | 1.4% | Council Bluffs Community School District / 59,123 |
| 179. | 1.3% | Treynor Community School District / 2,814 |
| 180. | 1.3% | Newton Community School District / 21,120 |
| 180. | 1.3% | Postville Community School District / 3,717 |
| 180. | 1.3% | North Fayette Community School District / 6,143 |
| 183. | 1.3% | Lake Mills Community School District / 4,087 |
| 184. | 1.3% | Galva-Holstein Community School District / 2,733 |
| 185. | 1.3% | Bettendorf Community School District / 21,648 |
| 186. | 1.3% | Westwood Community School District / 2,872 |
| 186. | 1.3% | Manning Community School District / 2,414 |
| 188. | 1.2% | Eastern Allamakee Community School District / 2,542 |
| 189. | 1.2% | Davenport Community School District / 105,189 |
| 189. | 1.2% | South Hamilton Community School District / 3,804 |
| 189. | 1.2% | Wall Lake View Auburn Community School District / 3,367 |
| 192. | 1.2% | Maquoketa Community School District / 9,196 |
| 192. | 1.2% | Elk Horn-Kimballton Community School District / 1,522 |
| 194. | 1.2% | Seymour Community School District / 2,521 |
| 194. | 1.2% | Dike-New Hartford Community School District / 4,570 |
| 196. | 1.2% | Columbus Community School District / 4,394 |
| 196. | 1.2% | Spirit Lake Community School District / 8,148 |
| 196. | 1.2% | Mount Ayr Community School District / 4,309 |
| 199. | 1.2% | Central Clinton Community School District / 9,472 |
| 199. | 1.2% | Starmont Community School District / 3,988 |
| 201. | 1.2% | Schaller-Crestland Community School District / 2,110 |
| 201. | 1.2% | West Des Moines Community School District / 62,978 |
| 203. | 1.2% | Des Moines Independent Community School District / 202,816 |
| 203. | 1.2% | Schleswig Community School District / 1,726 |
| 205. | 1.1% | Red Oak Community School District / 7,243 |
| 205. | 1.1% | Western Dubuque Community School District / 21,123 |
| 207. | 1.1% | Aplington-Parkersburg Community School District / 4,162 |
| 208. | 1.1% | Rockwell City-Lytton Community School District / 3,489 |
| 208. | 1.1% | Indianola Community School District / 19,148 |
| 210. | 1.1% | Twin Cedars Community School District / 2,445 |
| 211. | 1.1% | Nashua-Plainfield Community School District / 4,026 |
| 211. | 1.1% | Muscatine Community School District / 28,877 |
| 213. | 1.1% | Guthrie Center Community School District / 2,627 |
| 214. | 1.1% | Le Mars Community School District / 13,057 |
| 214. | 1.1% | Sioux City Community School District / 82,522 |
| 214. | 1.1% | Clinton Community School District / 26,447 |
| 214. | 1.1% | Edgewood-Colesburg Community School District / 2,945 |
| 214. | 1.1% | Charter Oak-Ute Community School District / 1,766 |
| 219. | 1.1% | Kingsley-Pierson Community School District / 2,697 |
| 219. | 1.1% | Sigourney Community School District / 3,538 |
| 221. | 1.0% | Okoboji Community School District / 6,263 |
| 222. | 1.0% | Algona Community School District / 9,393 |
| 222. | 1.0% | Lawton-Bronson Community School District / 3,246 |
| 222. | 1.0% | Valley Community School District / 2,722 |
| 225. | 1.0% | Rudd-Rockford-Marble Rock Community School District / 3,104 |
| 226. | 1.0% | Clarke Community School District / 7,975 |
| 227. | 1.0% | Anthon-Oto Community School District / 1,588 |
| 227. | 1.0% | Calamus-Wheatland Community School District / 2,484 |
| 229. | 1.0% | Harlan Community School District / 9,042 |
| 230. | 1.0% | Mount Pleasant Community School District / 12,837 |
| 230. | 1.0% | Dubuque Community School District / 74,935 |
| 230. | 1.0% | Armstrong-Ringsted Community School District / 2,375 |
| 233. | 0.9% | Harris-Lake Park Community School District / 1,931 |
| 233. | 0.9% | Boyden-Hull Community School District / 4,106 |
| 235. | 0.9% | Bedford Community School District / 2,877 |
| 236. | 0.9% | Louisa-Muscatine Community School District / 4,644 |
| 236. | 0.9% | Cal Community School District / 1,724 |
| 236. | 0.9% | Cardinal Community School District / 4,743 |
| 239. | 0.9% | Adel-De Soto-Minburn Community School District / 7,457 |
| 239. | 0.9% | Durant Community School District / 3,280 |
| 239. | 0.9% | Knoxville Community School District / 11,532 |
| 242. | 0.8% | Storm Lake Community School District / 11,960 |
| 242. | 0.8% | George-Little Rock Community School District / 2,774 |
| 244. | 0.8% | Jesup Community School District / 4,684 |
| 245. | 0.8% | Tri-Center Community School District / 3,569 |
| 245. | 0.8% | Aurelia Community School District / 1,907 |
| 247. | 0.8% | Hinton Community School District / 2,697 |
| 247. | 0.8% | Panorama Community School District / 4,858 |
| 247. | 0.8% | Twin Rivers Community School District / 1,264 |
| 250. | 0.8% | North Iowa Community School District / 3,332 |
| 251. | 0.8% | Shenandoah Community School District / 6,227 |
| 251. | 0.8% | Maple Valley Community School District / 2,951 |
| 253. | 0.8% | Northeast Community School District / 2,774 |
| 254. | 0.7% | Atlantic Community School District / 8,550 |
| 255. | 0.7% | Akron-Westfield Community School District / 3,466 |
| 255. | 0.7% | Riverside Community School District / 3,769 |
| 257. | 0.7% | Southeast Polk Community School District / 30,372 |
| 257. | 0.7% | Clarksville Community School District / 2,279 |
| 257. | 0.7% | PCM Community School District / 4,875 |
| 260. | 0.7% | Albia Community School District / 7,362 |
| 260. | 0.7% | Rock Valley Community School District / 4,755 |
| 262. | 0.7% | Lu Verne Community School District / 514 |
| 262. | 0.7% | Estherville Lincoln Central Community School District / 8,148 |
| 264. | 0.7% | South Page Community School District / 1,572 |
| 265. | 0.7% | Ottumwa Community School District / 28,801 |
| 265. | 0.7% | Northeast Hamilton Community School District / 1,557 |
| 265. | 0.7% | Alta Community School District / 2,899 |
| 268. | 0.7% | Maquoketa Valley Community School District / 4,516 |
| 269. | 0.6% | Audubon Community School District / 3,566 |
| 270. | 0.6% | Albert City-Truesdale Community School District / 1,472 |
| 270. | 0.6% | Oskaloosa Community School District / 15,690 |
| 272. | 0.6% | Southern Cal Community School District / 3,104 |
| 272. | 0.6% | Interstate 35 Community School District / 4,574 |
| 272. | 0.6% | River Valley Community School District / 2,759 |
| 275. | 0.6% | Martensdale-St. Marys Community School District / 2,672 |
| 275. | 0.6% | Andrew Community School District / 1,639 |
| 277. | 0.6% | IKM Community School District / 2,495 |
| 277. | 0.6% | East Union Community School District / 3,300 |
| 279. | 0.6% | Danville Community School District / 2,591 |
| 280. | 0.6% | Newell-Fonda Community School District / 2,341 |
| 281. | 0.5% | Denver Community School District / 3,803 |
| 281. | 0.5% | Coon Rapids-Bayard Community School District / 2,508 |
| 281. | 0.5% | Fort Madison Community School District / 17,198 |
| 284. | 0.5% | Battle Creek-Ida Grove Community School District / 4,107 |
| 284. | 0.5% | Hampton-Dumont Community School District / 7,055 |
| 284. | 0.5% | Rockwell-Swaledale Community School District / 2,020 |
| 287. | 0.5% | Hartley-Melvin-Sanborn Community School District / 4,443 |
| 287. | 0.5% | Griswold Community School District / 3,529 |
| 289. | 0.5% | Colo-Nesco Community School District / 3,209 |
| 290. | 0.5% | Eagle Grove Community School District / 4,782 |
| 291. | 0.5% | Corning Community School District / 3,140 |
| 292. | 0.5% | Sheldon Community School District / 6,897 |
| 293. | 0.5% | Walnut Community School District / 1,288 |
| 294. | 0.4% | South O'Brien Community School District / 4,872 |
| 294. | 0.4% | West Central Valley Community School District / 5,772 |
| 296. | 0.4% | Harmony Community School District / 2,704 |
| 296. | 0.4% | Bennett Community School District / 1,277 |
| 298. | 0.4% | Dunkerton Community School District / 2,498 |
| 298. | 0.4% | Burlington Community School District / 29,454 |
| 300. | 0.4% | Eddyville-Blakesburg Community School District / 3,922 |
| 301. | 0.4% | South Clay Community School District / 992 |
| 301. | 0.4% | Pekin Community School District / 3,760 |
| 301. | 0.4% | Van Buren Community School District / 5,222 |
| 304. | 0.4% | Winfield-Mount Union Community School District / 2,229 |
| 305. | 0.4% | West Burlington Independent School District / 2,880 |
| 305. | 0.4% | Hubbard-Radcliffe Community School District / 2,705 |
| 307. | 0.3% | Ruthven-Ayrshire Community School District / 1,609 |
| 307. | 0.3% | New Market Community School District / 1,146 |
| 309. | 0.3% | Wayne Community School District / 3,282 |
| 309. | 0.3% | Remsen-Union Community School District / 3,131 |
| 309. | 0.3% | Perry Community School District / 9,211 |
| 312. | 0.3% | Clay Central-Everly Community School District / 2,377 |
| 312. | 0.3% | Essex Community School District / 1,478 |
| 314. | 0.3% | Odebolt-Arthur Community School District / 2,236 |
| 314. | 0.3% | Chariton Community School District / 7,666 |
| 314. | 0.3% | Pleasantville Community School District / 3,464 |
| 317. | 0.3% | MOC-Floyd Valley Community School District / 10,720 |
| 318. | 0.3% | East Greene Community School District / 1,765 |
| 318. | 0.3% | Spencer Community School District / 12,119 |
| 318. | 0.3% | Stratford Community School District / 1,290 |
| 318. | 0.3% | Woodward-Granger Community School District / 5,097 |
| 318. | 0.3% | Russell Community School District / 958 |
| 323. | 0.3% | Central Lyon Community School District / 4,250 |
| 324. | 0.3% | Colfax-Mingo Community School District / 5,134 |
| 324. | 0.3% | Southeast Warren Community School District / 3,043 |
| 326. | 0.2% | Keokuk Community School District / 13,261 |
| 326. | 0.2% | Mormon Trail Community School District / 1,721 |
| 328. | 0.2% | Moulton-Udell Community School District / 1,648 |
| 329. | 0.2% | Davis County Community School District / 8,468 |
| 329. | 0.2% | Titonka Consolidated School District / 983 |
| 331. | 0.2% | Wapsie Valley Community School District / 3,671 |
| 331. | 0.2% | Hamburg Community School District / 1,686 |
| 331. | 0.2% | North Kossuth Community School District / 2,193 |
| 334. | 0.2% | Sentral Community School District / 1,103 |
| 334. | 0.2% | Preston Community School District / 1,875 |
| 336. | 0.2% | Van Meter Community School District / 3,048 |
| 336. | 0.2% | Sibley-Ocheyedan Community School District / 4,882 |
| 338. | 0.2% | Melcher-Dallas Community School District / 2,028 |
| 338. | 0.2% | Camanche Community School District / 5,419 |
| 340. | 0.2% | Sac Community School District / 2,754 |
| 341. | 0.2% | East Central Community School District / 2,163 |
| 341. | 0.2% | Adair-Casey Community School District / 2,210 |
| 343. | 0.1% | Collins-Maxwell Community School District / 2,745 |
| 343. | 0.1% | Boyer Valley Community School District / 2,622 |
| 345. | 0.1% | Marcus-Meriden-Cleghorn Community School District / 2,798 |
| 346. | 0.0% | Sioux Central Community School District / 2,686 |
| 347. | 0.0% | Central Decatur Community School District / 4,493 |
Please note that we only rank locations with 'Czech as First Ancestry Population Percentage' data. The rank above might not be a complete list. Locations without 'Czech as First Ancestry Population Percentage' data are not listed.
*ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.
