= Data not available
= Data available
| State | 1993 | 1995 | 1997 | 1999 | 2001 | 2003 | 2005 | 2007 |
| Alabama | ![]() |
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| Alaska | ![]() |
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| Arizona | ![]() |
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| Arkansas | ![]() |
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| Colorado | ![]() |
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| Connecticut | ![]() |
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| Delaware | ![]() |
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| Florida | ![]() |
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| Georgia | ![]() |
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| Hawaii | ![]() |
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| Idaho | ![]() |
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| Illinois | ![]() |
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| Indiana | ![]() |
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| Iowa | ![]() |
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| Kansas | ![]() |
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| Kentucky | ![]() |
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| Louisiana | ![]() |
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| Maine | ![]() |
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| Maryland | ![]() |
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| Massachusetts | ![]() |
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| Michigan | ![]() |
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| Mississippi | ![]() |
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| Missouri | ![]() |
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| Montana | ![]() |
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| Nebraska | ![]() |
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| Nevada | ![]() |
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| New Hampshire | ![]() |
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| New Jersey | ![]() |
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| New Mexico | ![]() |
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| New York | ![]() |
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| North Carolina | ![]() |
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| North Dakota | ![]() |
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| Ohio | ![]() |
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| Oklahoma | ![]() |
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| Pennsylvania | ![]() |
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| Rhode Island | ![]() |
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| South Carolina | ![]() |
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| South Dakota | ![]() |
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| Tennessee | ![]() |
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| Texas | ![]() |
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| Utah | ![]() |
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| Vermont | ![]() |
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| Virginia | ![]() |
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| West Virginia | ![]() |
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| Wisconsin | ![]() |
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| Wyoming | ![]() |
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