| Residency | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 1,202 | 1,574 | 1,865 | 2,241 | 2,590 | 3,066 | 3,321 | 3,536 | 3,708 | 3,756 |
| U.S. Resident | 1,123 | 1,557 | 1,841 | 2,202 | 2,549 | 3,030 | 3,292 | 3,504 | 3,678 | 3,728 |
| Nonresident Alien | 4 | 6 | 10 | 14 | 18 | 21 | 21 | 24 | 23 | 20 |
| Unknown | 75 | 11 | 14 | 25 | 23 | 15 | 8 | 8 | 7 | 8 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 93.4% | 98.9% | 98.7% | 98.3% | 98.4% | 98.8% | 99.1% | 99.1% | 99.2% | 99.3% |
| Nonresident Alien | 0.3% | 0.4% | 0.5% | 0.6% | 0.7% | 0.7% | 0.6% | 0.7% | 0.6% | 0.5% |
| Unknown | 6.2% | 0.7% | 0.8% | 1.1% | 0.9% | 0.5% | 0.2% | 0.2% | 0.2% | 0.2% |