| Residency | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 89 | 136 | 155 | 153 | 182 | 280 | 456 | 674 | 784 | 925 |
| U.S. Resident | 89 | 135 | 150 | 150 | 181 | 278 | 455 | 672 | 783 | 923 |
| Nonresident Alien | - | - | - | - | - | 1 | - | - | - | 1 |
| Unknown | - | 1 | 5 | 3 | 1 | 1 | 1 | 2 | 1 | 1 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 100.0% | 99.3% | 96.8% | 98.0% | 99.5% | 99.3% | 99.8% | 99.7% | 99.9% | 99.8% |
| Nonresident Alien | - | - | - | - | - | 0.4% | - | - | - | 0.1% |
| Unknown | - | 0.7% | 3.2% | 2.0% | 0.5% | 0.4% | 0.2% | 0.3% | 0.1% | 0.1% |