| Ethnicity | Year | |||||||||
| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
| Total | 132 | 164 | 182 | 201 | 221 | 272 | 248 | 315 | 387 | 408 |
| Hispanic/Latino | 1 | 8 | 5 | 3 | 2 | 3 | 4 | 7 | 14 | 17 |
| Non-Hispanic/Non-Latino | 90 | 122 | 151 | 184 | 208 | 258 | 236 | 303 | 369 | 387 |
| Unknown | 41 | 34 | 26 | 14 | 11 | 11 | 8 | 5 | 4 | 4 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Hispanic/Latino | 0.8% | 4.9% | 2.7% | 1.5% | 0.9% | 1.1% | 1.6% | 2.2% | 3.6% | 4.2% |
| Non-Hispanic/Non-Latino | 68.2% | 74.4% | 83.0% | 91.5% | 94.1% | 94.9% | 95.2% | 96.2% | 95.3% | 94.9% |
| Unknown | 31.1% | 20.7% | 14.3% | 7.0% | 5.0% | 4.0% | 3.2% | 1.6% | 1.0% | 1.0% |