| Residency | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 74 | 89 | 136 | 155 | 153 | 181 | 278 | 453 | 671 | 781 |
| U.S. Resident | 71 | 89 | 135 | 150 | 150 | 180 | 276 | 449 | 667 | 777 |
| Nonresident Alien | - | - | - | - | - | - | 1 | - | - | - |
| Unknown | 3 | - | 1 | 5 | 3 | 1 | 1 | 4 | 4 | 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 | 95.9% | 100.0% | 99.3% | 96.8% | 98.0% | 99.4% | 99.3% | 99.1% | 99.4% | 99.5% |
| Nonresident Alien | - | - | - | - | - | - | 0.4% | - | - | - |
| Unknown | 4.1% | - | 0.7% | 3.2% | 2.0% | 0.6% | 0.4% | 0.9% | 0.6% | 0.5% |