| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | |
| Total | 9,757 | 12,044 | 13,911 | 14,887 | 13,027 | 12,629 | 12,665 | 12,732 | 12,482 | 12,213 |
| U.S. Resident | 9,580 | 11,843 | 13,707 | 14,689 | 12,896 | 12,545 | 12,595 | 12,663 | 12,422 | 12,118 |
| Nonresident Alien | 150 | 185 | 191 | 187 | 124 | 78 | 65 | 63 | 58 | 82 |
| Unknown | 27 | 16 | 13 | 11 | 7 | 6 | 5 | 6 | 2 | 13 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 98.2% | 98.3% | 98.5% | 98.7% | 99.0% | 99.3% | 99.4% | 99.5% | 99.5% | 99.2% |
| Nonresident Alien | 1.5% | 1.5% | 1.4% | 1.3% | 1.0% | 0.6% | 0.5% | 0.5% | 0.5% | 0.7% |
| Unknown | 0.3% | 0.1% | 0.1% | 0.1% | 0.1% | 0.0% | 0.0% | 0.0% | 0.0% | 0.1% |