| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 36,951 | 39,958 | 42,219 | 44,262 | 45,475 | 45,290 | 46,106 | 47,039 | 48,677 | 50,624 |
| U.S. Resident | 36,456 | 39,429 | 41,708 | 43,845 | 45,034 | 44,899 | 45,589 | 46,623 | 48,207 | 50,139 |
| Nonresident Alien | 359 | 424 | 436 | 368 | 403 | 366 | 400 | 405 | 450 | 471 |
| Unknown | 136 | 105 | 75 | 49 | 38 | 25 | 117 | 11 | 20 | 14 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 98.7% | 98.7% | 98.8% | 99.1% | 99.0% | 99.1% | 98.9% | 99.1% | 99.0% | 99.0% |
| Nonresident Alien | 1.0% | 1.1% | 1.0% | 0.8% | 0.9% | 0.8% | 0.9% | 0.9% | 0.9% | 0.9% |
| Unknown | 0.4% | 0.3% | 0.2% | 0.1% | 0.1% | 0.1% | 0.3% | 0.0% | 0.0% | 0.0% |