| Residency | Year | |||||||||
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | |
| Total | 71 | 82 | 81 | 89 | 95 | 107 | 141 | 168 | 183 | 172 |
| U.S. Resident | 62 | 74 | 71 | 84 | 89 | 100 | 135 | 164 | 180 | 168 |
| Nonresident Alien | 2 | 3 | 1 | 2 | 4 | 5 | 4 | 2 | 2 | 4 |
| Unknown | 7 | 5 | 9 | 3 | 2 | 2 | 2 | 2 | 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 | 87.3% | 90.2% | 87.7% | 94.4% | 93.7% | 93.5% | 95.7% | 97.6% | 98.4% | 97.7% |
| Nonresident Alien | 2.8% | 3.7% | 1.2% | 2.2% | 4.2% | 4.7% | 2.8% | 1.2% | 1.1% | 2.3% |
| Unknown | 9.9% | 6.1% | 11.1% | 3.4% | 2.1% | 1.9% | 1.4% | 1.2% | 0.5% | - |