| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 12,049 | 13,912 | 14,887 | 13,027 | 12,627 | 12,664 | 12,728 | 12,472 | 12,198 | 12,230 |
| U.S. Resident | 11,848 | 13,708 | 14,689 | 12,896 | 12,543 | 12,594 | 12,659 | 12,412 | 12,140 | 12,183 |
| Nonresident Alien | 185 | 191 | 187 | 124 | 78 | 65 | 63 | 58 | 57 | 47 |
| Unknown | 16 | 13 | 11 | 7 | 6 | 5 | 6 | 2 | 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 | 98.3% | 98.5% | 98.7% | 99.0% | 99.3% | 99.4% | 99.5% | 99.5% | 99.5% | 99.6% |
| Nonresident Alien | 1.5% | 1.4% | 1.3% | 1.0% | 0.6% | 0.5% | 0.5% | 0.5% | 0.5% | 0.4% |
| Unknown | 0.1% | 0.1% | 0.1% | 0.1% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | - |