Figure 6.

Enrollment, number of teachers, pupil/teacher ratio, and expenditures in public schools: 1960–61 through 2005–06

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 School Systems, 1970 through 1980; 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 2005-06, and "National Public Education Financial Survey," 1989-90 through 2004-05.