No policy (1) | (3) | 2 years (7) | 3 years (33) | 4 years (5) | 5 years (2) | |
---|---|---|---|---|---|---|
DC | Hawaii | California | Alabama | New Jersey | Connecticut | Indiana |
 | Mississippi | Maine | Alaska | New Mexico | Illinois | Missouri |
 | N. Dakota | Maryland | Arizona | New York | Kentucky |  |
 |  | Nevada | Arkansas | Ohio | Michigan |  |
 |  | S. Carolina | Colorado | Oklahoma | N. Carolina |  |
 |  | Vermont | Delaware | Oregon |  |  |
 |  | Washington | Florida | Pennsylvania |  |  |
 |  |  | Georgia | Rhode Island |  |  |
 |  |  | Idaho | S. Dakota |  |  |
 |  |  | Iowa | Tennessee |  |  |
 |  |  | Kansas | Texas |  |  |
 |  |  | Louisiana | Utah |  |  |
 |  |  | Massachusetts | Virginia |  |  |
 |  |  | Minnesota | West Virginia |  |  |
 |  |  | Montana | Wisconsin |  |  |
 |  |  | Nebraska | Wyoming |  |  |
 |  |  | N. Hampshire |  |  |  |