| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | |
| Total | 69 | 70 | 65 | 71 | 102 | 132 | 140 | 127 | 139 | 150 |
| U.S. Resident | 59 | 66 | 59 | 65 | 97 | 129 | 137 | 124 | 136 | 150 |
| Nonresident Alien | 1 | 2 | 4 | 5 | 4 | 2 | 2 | 3 | 3 | - |
| Unknown | 9 | 2 | 2 | 1 | 1 | 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 | 85.5% | 94.3% | 90.8% | 91.5% | 95.1% | 97.7% | 97.9% | 97.6% | 97.8% | 100.0% |
| Nonresident Alien | 1.4% | 2.9% | 6.2% | 7.0% | 3.9% | 1.5% | 1.4% | 2.4% | 2.2% | - |
| Unknown | 13.0% | 2.9% | 3.1% | 1.4% | 1.0% | 0.8% | 0.7% | - | - | - |