evidence: NOTE: Although data are for the 50 states and the District of Columbia, data limitations result in inclusion of a small (but unknown) number of students from other jurisdictions. Includes imputations for missing or unavailable data from Iowa. Race categories exclude persons of Hispanic ethnicity. Figures are plotted based on unrounded data. [...] 1 Data throughout this indicator represent the 50 states and the District of Columbia unless otherwise noted. 2 Totals presented in this indicator include imputations for states for which data were unavailable. See reference tables in the Digest of Education Statistics for more information.