| Residency | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 192 | 201 | 202 | 237 | 228 | 251 | 223 | 202 | 209 | 198 |
| U.S. Resident | 191 | 199 | 200 | 234 | 225 | 248 | 219 | 195 | 204 | 193 |
| Nonresident Alien | - | 1 | - | 1 | 2 | 2 | 3 | 5 | 5 | 5 |
| Unknown | 1 | 1 | 2 | 2 | 1 | 1 | 1 | 2 | - | - |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 99.5% | 99.0% | 99.0% | 98.7% | 98.7% | 98.8% | 98.2% | 96.5% | 97.6% | 97.5% |
| Nonresident Alien | - | 0.5% | - | 0.4% | 0.9% | 0.8% | 1.3% | 2.5% | 2.4% | 2.5% |
| Unknown | 0.5% | 0.5% | 1.0% | 0.8% | 0.4% | 0.4% | 0.4% | 1.0% | - | - |