| United States1 | 2.7 | 2,3 | 2.6 | 2,3 | 2.6 | 2,3 | 2.7 | 2,3 | 2.7 | 2,3 | 2.7 | 2,3 | 2.6 | 2,3 |
| | | | | | | | | | | | | | | |
| Alabama | 8.3 | | 8.2 | | 8.2 | | 8.1 | | 8.2 | | 7.6 | | 8.5 | |
| Alaska | 2.1 | | 1.9 | | 2.2 | | 2.2 | | 2.2 | | 2.3 | | 2.5 | |
| Arizona | 2.5 | 3 | 2.8 | 3 | 2.0 | 2 | 2.3 | | 2.3 | | 2.4 | | 2.3 | |
| Arkansas | 4.5 | | 3.1 | | 3.1 | 2 | 4.7 | | 4.8 | | 4.8 | | 5.2 | |
| California | 1.2 | | 1.2 | | 1.2 | | 1.2 | | 1.1 | | 1.2 | | 1.2 | |
| | | | | | | | | | | | | | | |
| Colorado | 3.4 | | 3.5 | | 2.9 | | 3.4 | | 3.5 | | 3.2 | | 3.4 | |
| Connecticut | 2.9 | 2 | 3.0 | 2 | 3.0 | 2 | 2.8 | 2 | 2.7 | 2 | 2.9 | 2 | 2.8 | 2 |
| Delaware | 1.8 | 2 | 1.8 | 2 | 1.7 | 2 | 1.7 | 2 | 1.6 | | 1.6 | | 1.5 | |
| District of Columbia | 1.4 | 2 | 1.5 | 2 | 0.5 | | 0.5 | | 0.5 | | 0.5 | | 0.5 | |
| Florida | 4.2 | | 4.1 | | 4.1 | | 4.1 | | 3.8 | | 3.8 | | 3.8 | |
| | | | | | | | | | | | | | | |
| Georgia | 2.5 | 3 | 2.0 | | 2.3 | | 2.0 | | 2.0 | | 2.0 | | 1.9 | |
| Hawaii | 1.9 | | 1.8 | | 1.7 | | 1.6 | | 1.9 | | 1.9 | | 1.9 | |
| Idaho | 2.3 | | 2.2 | | 2.0 | | 2.0 | | 1.9 | | 1.8 | | 1.8 | |
| Illinois | 2.2 | 3 | 2.3 | 3 | 2.2 | 3 | 2.4 | 3 | 2.4 | 3 | 2.2 | | 2.3 | |
| Indiana | 4.5 | | 3.0 | | 3.3 | | 3.1 | | 3.1 | | 3.0 | | 3.2 | |
| | | | | | | | | | | | | | | |
| Iowa | 2.6 | | 2.7 | | 6.1 | | 5.9 | | 5.5 | | 5.8 | | 5.3 | |
| Kansas | 2.8 | | 2.9 | | 3.0 | | 2.8 | | 2.5 | | 2.5 | | 2.5 | |
| Kentucky | 1.9 | | 2.1 | | 0.7 | | 0.8 | | 0.8 | | 0.8 | | 0.8 | |
| Louisiana | 2.6 | 2 | 2.7 | 2 | 2.8 | 2 | 2.6 | 2 | 2.6 | 2 | 2.6 | 2 | 2.6 | 2 |
| Maine | 0.3 | | 0.3 | | 0.3 | | 1.1 | | 1.1 | | 1.1 | | 1.1 | |
| | | | | | | | | | | | | | | |
| Maryland | 2.9 | | 3.0 | | 3.2 | | 3.1 | | 3.1 | | 3.1 | | 3.2 | |
| Massachusetts | 2.0 | | 2.0 | | 2.0 | | 2.0 | | 1.8 | | 2.3 | | 1.6 | |
| Michigan | 2.4 | | 2.3 | | 2.1 | | 1.9 | | 1.9 | | 1.9 | | 2.0 | |
| Minnesota | 3.4 | | 3.6 | | 3.7 | | 3.8 | | 3.8 | | 3.7 | | 3.8 | |
| Mississippi | 3.9 | | 3.8 | | 3.9 | | 3.8 | | 3.6 | | 3.4 | | 3.4 | |
| | | | | | | | | | | | | | | |
| Missouri | 4.2 | | 4.0 | | 4.2 | | 4.1 | | 4.2 | | 4.1 | | 4.0 | |
| Montana | 1.8 | | 3.3 | | 3.9 | | 4.0 | | 4.0 | | 4.1 | | 4.3 | |
| Nebraska | 8.0 | | 8.0 | | 8.9 | | 6.2 | | 6.1 | | 6.0 | | 5.9 | |
| Nevada | 1.6 | | 3.5 | | 3.5 | | 3.6 | | 3.7 | | 3.9 | | 3.7 | |
| New Hampshire | 3.0 | | 2.5 | | 2.6 | | 2.3 | | 2.4 | | 2.3 | | 2.6 | |
| | | | | | | | | | | | | | | |
| New Jersey | 2.7 | 3 | 1.9 | 3 | 1.9 | 3 | 2.3 | 3 | 2.5 | 3 | 2.7 | 3 | 2.4 | 3 |
| New Mexico | 2.4 | | 2.5 | | 2.5 | | 2.5 | | 2.3 | | 2.2 | | 2.2 | |
| New York | 1.1 | | 1.0 | | 1.0 | | 1.5 | | 1.0 | | 0.9 | | 0.9 | |
| North Carolina | 4.1 | 2 | 4.0 | 2 | 4.1 | 2 | 4.0 | 2 | 4.1 | 2 | 2.8 | | 2.8 | |
| North Dakota | 5.7 | | 5.7 | | 5.6 | | 5.3 | | 5.3 | | 5.3 | | 5.4 | |
| | | | | | | | | | | | | | | |
| Ohio | 4.3 | | 4.2 | | 4.0 | | 4.1 | | 4.1 | | 4.2 | | 4.1 | |
| Oklahoma | 2.6 | 2,3 | 3.4 | 2 | 3.6 | 2 | 4.6 | 2,3 | 4.3 | 3 | 5.3 | | 5.5 | |
| Oregon | 3.0 | | 2.9 | | 3.0 | | 2.9 | | 3.1 | | 3.2 | | 3.6 | |
| Pennsylvania | 2.0 | | 2.0 | | 2.0 | | 2.0 | | 1.9 | | 1.9 | | 1.8 | |
| Rhode Island | 1.8 | | 1.2 | | 1.2 | | 0.7 | | 1.1 | | 1.1 | | 1.3 | |
| | | | | | | | | | | | | | | |
| South Carolina | 4.1 | 3 | 4.1 | 3 | 4.2 | | 4.4 | | 4.4 | | 4.4 | | 4.4 | |
| South Dakota | 3.3 | | 2.8 | | 3.4 | | 3.1 | | 2.9 | | 3.0 | | 3.1 | |
| Tennessee | 6.4 | | 7.5 | | 7.7 | | 7.1 | | 6.8 | | 6.7 | | 6.5 | |
| Texas | 3.3 | | 2.9 | | 2.8 | | 2.9 | | 2.7 | | 2.8 | | 2.6 | |
| Utah | 2.8 | | 2.8 | | 3.5 | | 3.5 | | 5.4 | | 5.5 | | 5.1 | |
| | | | | | | | | | | | | | | |
| Vermont | 2.0 | | 1.9 | | 2.0 | | 1.8 | | 2.1 | | 2.4 | | 2.6 | |
| Virginia | 2.8 | 2 | 2.9 | 2 | 3.0 | 2 | 2.8 | 2 | 3.7 | 2 | 3.4 | 2 | 3.4 | 2 |
| Washington | 3.2 | | 3.3 | 3 | 3.0 | 3 | 3.0 | 3 | 3.1 | 3 | 3.1 | 3 | 3.1 | 3 |
| West Virginia | 1.5 | | 1.6 | | 1.5 | | 1.5 | | 1.5 | | 1.5 | | 1.6 | |
| Wisconsin | 1.9 | | 2.0 | | 2.0 | | 1.9 | | 2.0 | | 2.1 | | 2.1 | |
| Wyoming | 2.8 | | 1.7 | | 1.6 | | 1.7 | | 1.6 | | 1.7 | | 1.7 | |
| | | | | | | | | | | | | | | |
| Other jurisdictions | | | | | | | | | | | | | | |
| American Samoa | 0.3 | | 0.3 | | 0.5 | | 0.5 | | 0.4 | | 0.3 | | 0.2 | |
| Guam | 1.7 | | 1.7 | | 1.5 | | 0.8 | | 1.0 | | 0.9 | | 0.8 | |
| Northern Marianas | — | | # | | — | | 0.1 | | 0.2 | | 0.2 | | 0.1 | |
| Puerto Rico | # | | # | | # | | 0.1 | | # | | # | | # | |
| U.S. Virgin Islands | # | | # | | # | | # | | 0.1 | | 0.1 | | 0.1 | |
| See notes at end of table. |