| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 2,477 | 2,420 | 2,255 | 2,054 | 1,808 | 1,588 | 1,329 | 1,323 | 1,406 | 1,684 |
| U.S. Resident | 2,458 | 2,406 | 2,246 | 2,046 | 1,807 | 1,582 | 1,319 | 1,318 | 1,401 | 1,673 |
| Nonresident Alien | 7 | 7 | 9 | 8 | 1 | 6 | 9 | 5 | 5 | 11 |
| Unknown | 12 | 7 | - | - | - | - | 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 | 99.2% | 99.4% | 99.6% | 99.6% | 99.9% | 99.6% | 99.2% | 99.6% | 99.6% | 99.3% |
| Nonresident Alien | 0.3% | 0.3% | 0.4% | 0.4% | 0.1% | 0.4% | 0.7% | 0.4% | 0.4% | 0.7% |
| Unknown | 0.5% | 0.3% | - | - | - | - | 0.1% | - | - | - |