| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 1,433 | 1,507 | 1,609 | 1,648 | 1,623 | 1,576 | 1,569 | 1,435 | 1,231 | 1,027 |
| U.S. Resident | 1,419 | 1,492 | 1,594 | 1,638 | 1,615 | 1,570 | 1,565 | 1,430 | 1,227 | 1,022 |
| Nonresident Alien | 9 | 7 | 10 | 8 | 7 | 5 | 4 | 5 | 4 | 5 |
| Unknown | 5 | 8 | 5 | 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 | 99.0% | 99.0% | 99.1% | 99.4% | 99.5% | 99.6% | 99.7% | 99.7% | 99.7% | 99.5% |
| Nonresident Alien | 0.6% | 0.5% | 0.6% | 0.5% | 0.4% | 0.3% | 0.3% | 0.3% | 0.3% | 0.5% |
| Unknown | 0.3% | 0.5% | 0.3% | 0.1% | 0.1% | 0.1% | - | - | - | - |