| Year | Fall | Mid-Winter | Spring | Summer I | Summer II | Total |
| 2006-07 | 20,476 | |||||
| 2005-06 | 22,223 | 342 | 20,005 | 3,201 | 2,686 | 48,457 |
| 2004-05 | 22,329 | 348 | 20,968 | 3,998 | 3,009 | 50,652 |
| 2003-04 | 24,515 | 341 | 21,966 | 4,091 | 3,111 | 54,024 |
| 2002-03 | 22,246 | 333 | 20,912 | 4,393 | 3,986 | 51,870 |
| 2001-02 | 22,790 | 354 | 20,206 | 4,203 | 3,553 | 51,106 |
| 2000-01 | 22,749 | 374 | 20,598 | 4,238 | 3,348 | 51,307 |
| 1999-00 | 22,357 | 333 | 22,418 | 3,728 | 4,546 | 53,044 |
| 1998-99 | 25,505 | 23,280 | 5,051 | 4,145 | 57,981 | |
| 1997-98 | 26,963 | 25,226 | 5,984 | 4,484 | 62,657 | |
| 1996-97 | 28,242 | 26,256 | 5,994 | 4,777 | 65,269 | |
| 1995-96 | 28,742 | 27,118 | 6,162 | 4,804 | 66,826 | |
| 1994-95 | 27,991 | 26,382 | 6,267 | 4,805 | 65,445 | |
| 1993-94 | 25,503 | 25,243 | 6,834 | 5,234 | 62,814 | |
| 1992-93 | 24,677 | 23,591 | 6,411 | 5,207 | 59,886 | |
| 1991-92 | 24,131 | 23,475 | 6,494 | 4,935 | 59,035 | |
| 1990-91 | 22,265 | 21,707 | 6,173 | 4,395 | 54,540 | |
| 1989-90 | 22,852 | 21,376 | 6,042 | 4,672 | 54,942 | |
| 1988-89 | 22,443 | 20,973 | 6,118 | 4,410 | 53,944 | |
| 1987-88 | 21,435 | 20,321 | 5,308 | 3,879 | 50,943 | |
| 1986-87 | 21,830 | 20,075 | 5,100 | 3,432 | 50,437 | |
| 1985-86 | 20,988 | 20,219 | 5,901 | 4,250 | 51,358 | |
| 1984-85 | 22,568 | 21,421 | 5,946 | 4,837 | 54,772 | |
| 1983-84 | 25,062 | 22,836 | 7,174 | 4,951 | 60,023 | |
| 1982-83 | 23,997 | 23,178 | 7,177 | 5,285 | 59,637 | |
| 1981-82 | 20,377 | 19,933 | 6,190 | 4,873 | 51,373 | |
| 1980-81 | 21,511 | 19,798 | 5,513 | 4,481 | 51,303 | |
| 1979-80 | 22,068 | 19,941 | 5,710 | 4,559 | 52,278 | |
| 1978-79 | 22,510 | 21,044 | 5,820 | 4,570 | 53,944 | |
| 1977-78 | 22,033 | 21,490 | 5,977 | 4,825 | 54,325 | |
| 1976-77 | 24,133 | 25,185 | 5,757 | 4,228 | 59,303 | |
| 1975-76 | 27,527 | 26,588 | 8,796 | 6,692 | 69,603 | |
| 1974-75 | 30,641 | 29,390 | 8,202 | 6,701 | 74,934 | |
| 1973-74 | 31,298 | 29,845 | 8,962 | 6,877 | 76,982 | |
| 1972-73 | 32,111 | 29,581 | 9,005 | 7,024 | 77,721 | |
| 1971-72 | 34,393 | 30,528 | 7,678 | 5,413 | 78,012 | |
| 1970-71 | 36,154 | 33,022 | 7,320 | 5,381 | 81,877 | |
| 1969-70 | 33,006 | 30,470 | 7,303 | 5,658 | 76,437 | |
| 1968-69 | 31,573 | 29,124 | 6,413 | 5,548 | 72,658 | |
| 1967-68 | 28,254 | 27,758 | 6,432 | 5,488 | 67,932 | |
| 1966-67 | 26,310 | 24,636 | 5,938 | 4,723 | 61,607 | |
| 1965-66 | 23,655 | 20,852 | 5,361 | 4,369 | 54,237 | |
| 1964-65 | 19,926 | 19,328 | 5,388 | 3,885 | 48,527 | |
| 1963-64 | 18,320 | 17,415 | 4,653 | 3,543 | 43,931 | |
| 1962-63 | 17,884 | 16,856 | 4,852 | 3,750 | 43,342 | |
| 1961-62 | 17,828 | 15,739 | 4,819 | 3,710 | 42,096 | |
| 1960-61 | 14,652 | 14,677 | 4,450 | 3,649 | 37,428 | |
| 1959-60 | 13,451 | 12,451 | 4,036 | 3,173 | 33,111 | |
| 1958-59 | 13,777 | 12,794 | 4,087 | 3,228 | 33,886 | |
| 1957-58 | 12,880 | 13,777 | 3,928 | 3,354 | 33,939 | |
| Source: Curriculum Reports | ||||||
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