| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 1,873 | 2,175 | 3,002 | 3,659 | 4,265 | 4,194 | 4,137 | 4,110 | 4,167 | 3,577 |
| U.S. Resident | 1,839 | 2,110 | 2,925 | 3,557 | 4,141 | 4,075 | 4,031 | 4,015 | 4,088 | 3,511 |
| Nonresident Alien | 26 | 34 | 44 | 71 | 97 | 98 | 87 | 86 | 73 | 65 |
| Unknown | 8 | 31 | 33 | 31 | 27 | 21 | 19 | 9 | 6 | 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 | 98.2% | 97.0% | 97.4% | 97.2% | 97.1% | 97.2% | 97.4% | 97.7% | 98.1% | 98.2% |
| Nonresident Alien | 1.4% | 1.6% | 1.5% | 1.9% | 2.3% | 2.3% | 2.1% | 2.1% | 1.8% | 1.8% |
| Unknown | 0.4% | 1.4% | 1.1% | 0.8% | 0.6% | 0.5% | 0.5% | 0.2% | 0.1% | 0.0% |