| Residency | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | |
| Total | 59,828 | 65,207 | 71,558 | 76,797 | 78,359 | 81,739 | 85,213 | 88,715 | 92,845 | 97,248 |
| U.S. Resident | 58,898 | 64,293 | 70,576 | 75,842 | 77,514 | 80,866 | 84,329 | 87,677 | 91,905 | 96,180 |
| Nonresident Alien | 584 | 659 | 749 | 771 | 709 | 760 | 797 | 864 | 890 | 938 |
| Unknown | 346 | 255 | 233 | 184 | 136 | 113 | 87 | 174 | 50 | 130 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| U.S. Resident | 98.4% | 98.6% | 98.6% | 98.8% | 98.9% | 98.9% | 99.0% | 98.8% | 99.0% | 98.9% |
| Nonresident Alien | 1.0% | 1.0% | 1.0% | 1.0% | 0.9% | 0.9% | 0.9% | 1.0% | 1.0% | 1.0% |
| Unknown | 0.6% | 0.4% | 0.3% | 0.2% | 0.2% | 0.1% | 0.1% | 0.2% | 0.1% | 0.1% |