| year | enrollment | income |
| 1987 | 1,158,291 | ($128,662,931) |
| 1988 | 1,299,401 | ($141,403,887) |
| 1989 | 1,334,435 | $32,403,625 |
| 1990 | 1,619,919 | $91,297,866 |
| 1991 | 1,734,586 | $93,066,348 |
| 1992 | 2,079,001 | $137,014,768 |
| 1993 | 2,461,119 | $309,832,745 |
| 1994 | 2,960,755 | $373,961,062 |
| 1995 | 3,448,207 | $215,461,925 |
| 1996 | 2,065,272 | ($58,606,316) |
| 1997 | 2,000,111 | ($34,299,324) |
| 1998 | 4,750,994 | ($76,975,902) |
