An Historical View...
| Year | Percentage |
|---|---|
| 1899-1900 | 6.4 |
| 1909-1910 | 8.8 |
| 1919-1920 | 16.8 |
| 1929-1930 | 29.0 |
| 1939-1940 | 50.8 |
| 1941-1942 | 51.2 |
| 1943-1944 | 42.3 |
| 1945-1946 | 47.9 |
| 1947-1948 | 54.0 |
| 1949-1950 | 59.0 |
| 1951-1952 | 58.6 |
| 1953-1954 | 60.0 |
| 1955-1956 | 62.3 |
| 1957-1958 | 64.8 |
| 1959-1960 | 65.1 |
| 1961-1962 | 69.5 |
| 1963-1964 | 76.7 |
*This table is reproduced from Kenneth A. Simon and W. Vance Grant, Digest of Educational Statistics, Office of Education, Bulletin 1965, No. 4 (Washington, D.C., U.S. Government Printing Office, 1965).