| STATE | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 1990s TOTAL |
| CA | 347 | 1 | 1 | 0 | 30 | 42 | 13 | 207 | 2 | 187 | 830 |
| MN | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 142 | 192 | 335 |
| IA | 0 | 0 | 1 | 0 | 0 | 2 | 0 | 2 | 3 | 312 | 320 |
| TX | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 151 | 151 |
| WY | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 108 | 110 |
| OR | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 38 | 0 | 38 |
| CO | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 29 | 29 |
| WI | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18 | 18 |
| AK | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 6 | 0 | 12 |
| VT | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | 0 | 0 | 12 |
| NE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 3 |
| ND | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 2 |
| IL | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 |
| MI | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
| NM | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |