| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 1,818 | 2,107 | 2,041 | 2,062 | 1,907 | 1,700 | 1,529 | 1,443 | 1,349 | 1,235 |
| U.S. Resident | 1,801 | 2,098 | 2,034 | 2,056 | 1,901 | 1,695 | 1,527 | 1,434 | 1,344 | 1,232 |
| Nonresident Alien | 6 | 6 | 4 | 6 | 6 | 5 | 2 | 9 | 5 | 2 |
| Unknown | 11 | 3 | 3 | - | - | - | - | - | - | 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 | 99.1% | 99.6% | 99.7% | 99.7% | 99.7% | 99.7% | 99.9% | 99.4% | 99.6% | 99.8% |
| Nonresident Alien | 0.3% | 0.3% | 0.2% | 0.3% | 0.3% | 0.3% | 0.1% | 0.6% | 0.4% | 0.2% |
| Unknown | 0.6% | 0.1% | 0.1% | - | - | - | - | - | - | 0.1% |