| Residency | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 2,885 | 3,413 | 3,635 | 3,810 | 4,066 | 3,933 | 3,957 | 3,905 | 3,760 | 3,519 |
| U.S. Resident | 2,863 | 3,397 | 3,602 | 3,782 | 4,037 | 3,897 | 3,925 | 3,878 | 3,739 | 3,507 |
| Nonresident Alien | 11 | 9 | 10 | 11 | 10 | 16 | 14 | 19 | 16 | 8 |
| Unknown | 11 | 7 | 23 | 17 | 19 | 20 | 18 | 8 | 5 | 4 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 99.2% | 99.5% | 99.1% | 99.3% | 99.3% | 99.1% | 99.2% | 99.3% | 99.4% | 99.7% |
| Nonresident Alien | 0.4% | 0.3% | 0.3% | 0.3% | 0.2% | 0.4% | 0.4% | 0.5% | 0.4% | 0.2% |
| Unknown | 0.4% | 0.2% | 0.6% | 0.4% | 0.5% | 0.5% | 0.5% | 0.2% | 0.1% | 0.1% |