| 1 | HAWAII | 2.0 |
| 2 | NEW HAMPSHIRE | 2.6 |
| 2 | NORTH DAKOTA | 2.6 |
| 4 | NEBRASKA | 2.7 |
| 5 | IOWA | 2.8 |
| 5 | VERMONT | 2.8 |
| 7 | IDAHO | 2.9 |
| 8 | MAINE | 3.0 |
| 8 | WISCONSIN | 3.0 |
| 10 | COLORADO | 3.1 |
| 10 | MINNESOTA | 3.1 |
| 10 | UTAH | 3.1 |
| 13 | TENNESSEE | 3.2 |
| 14 | INDIANA | 3.4 |
| 14 | KANSAS | 3.4 |
| 16 | ALABAMA | 3.5 |
| 16 | MASSACHUSETTS | 3.5 |
| 16 | MISSOURI | 3.5 |
| 16 | SOUTH DAKOTA | 3.5 |
| 20 | ARKANSAS | 3.7 |
| 20 | FLORIDA | 3.7 |
| 20 | VIRGINIA | 3.7 |
| 23 | TEXAS | 3.9 |
| 24 | MARYLAND | 4.0 |
| 25 | MONTANA | 4.1 |
| 25 | OKLAHOMA | 4.1 |
| 25 | OREGON | 4.1 |
| 25 | SOUTH CAROLINA | 4.1 |
| 29 | WYOMING | 4.2 |
| 30 | CALIFORNIA | 4.3 |
| 31 | GEORGIA | 4.4 |
| 31 | KENTUCKY | 4.4 |
| 31 | RHODE ISLAND | 4.4 |
| 34 | ARIZONA | 4.5 |
| 34 | NORTH CAROLINA | 4.5 |
| 34 | WASHINGTON | 4.5 |
| 37 | CONNECTICUT | 4.6 |
| 37 | DELAWARE | 4.6 |
| 37 | LOUISIANA | 4.6 |
| 37 | MISSISSIPPI | 4.6 |
| 37 | NEW YORK | 4.6 |
| 42 | MICHIGAN | 4.7 |
| 42 | OHIO | 4.7 |
| 42 | PENNSYLVANIA | 4.7 |
| 45 | ILLINOIS | 4.8 |
| 46 | NEVADA | 5.0 |
| 46 | NEW JERSEY | 5.0 |
| 48 | WEST VIRGINIA | 5.5 |
| 49 | DISTRICT OF COLUMBIA | 6.0 |
| 49 | NEW MEXICO | 6.0 |
| 51 | ALASKA | 7.3 |