| Residency | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 855 | 989 | 1,148 | 1,358 | 1,496 | 1,708 | 2,052 | 2,370 | 2,378 | 2,425 |
| U.S. Resident | 816 | 981 | 1,139 | 1,327 | 1,474 | 1,689 | 2,024 | 2,341 | 2,364 | 2,412 |
| Nonresident Alien | 1 | 4 | 3 | 4 | 4 | 6 | 7 | 8 | 7 | 9 |
| Unknown | 38 | 4 | 6 | 27 | 18 | 13 | 21 | 21 | 7 | 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 | 95.4% | 99.2% | 99.2% | 97.7% | 98.5% | 98.9% | 98.6% | 98.8% | 99.4% | 99.5% |
| Nonresident Alien | 0.1% | 0.4% | 0.3% | 0.3% | 0.3% | 0.4% | 0.3% | 0.3% | 0.3% | 0.4% |
| Unknown | 4.4% | 0.4% | 0.5% | 2.0% | 1.2% | 0.8% | 1.0% | 0.9% | 0.3% | 0.2% |