| High Number | Low Number | |||
| Year | Spring | Fall | Spring Census -- Low | Fall Census -- Low |
| 1986 | 328 | 0 | 0 | 0 |
| 1987 | 0 | 246 | 1 | 0 |
| 1988 | 207 | 226 | 1 | 0 |
| 1989 | 167 | 185 | 116 | 162 |
| 1990 | 146 | 300 | 132 | 250 |
| 1991 | 293 | 417 | 259 | 364 |
| 1992 | 399 | 374 | 354 | 290 |
| 1993 | 301 | 407 | 223 | 342 |
| 1994 | 372 | 439 | 357 | 398 |
| 1995 | 364 | 435 | 283 | 391 |
| 1996 | 335 | 414 | 282 | 0 |
| 1997 | 388 | 376 | 352 | 344 |
| 1998 | 473 | 583 | 451 | 549 |
| 1999 | 574 | 539 | 550 | 517 |