Figure 10.

Percentage of revenue for public elementary and secondary schools, by source of funds: 1970–71 through 2015–16

1 Includes intermediate sources below the state level. NOTE: Beginning in 1988–89, extensive changes were made in the data collection procedures. SOURCE: U.S. Department of Education, National Center for Education Statistics, Revenues and Expenditures for Public Elementary and Secondary Education, 1970–71 through 1986–87; and Common Core of Data (CCD), “National Public Education Financial Survey,” 1987–88 through 2015–16.