SOURCE: U.S. Department of Education, National Center for Education Statistics, Statistics of State School Systems, 1959–60 through 1969–70; Statistics of Public Elementary and Secondary
Day Schools, 1959–60 through 1980–81; Revenues and Expenditures for Public Elementary and Secondary Education, 1970–71 through 1980–81; and Common Core of Data
(CCD), "State Nonfiscal Survey of Public Elementary/Secondary Education," 1981–82 through 2009–10, and "National Public Education Financial Survey," 1989–90 through 2008–09.
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