| Age Groups | 20 - 24 | 25 -34 | 35 - 44 | 45 - 54 | 55 - 64 | 65+ |
| 2008 | ||||||
| Observations | 17 | 20 | 21 | 21 | 19 | 18 |
| Mean | 18.89 | 18.33 | 20.01 | 21.87 | 18.56 | 17.1 |
| Std. Dev. | 8.32 | 6.69 | 5.32 | 4.71 | 5.16 | 4.32 |
| Minimum | 10.1 | 11.3 | 11.9 | 15.5 | 11.6 | 9.6 |
| Kentucky | Georgia | Georgia | Louisiana | Nebraska | Nebraska | |
| Maximum | 46 | 36.1 | 34.4 | 30.6 | 30.8 | 28.4 |
| Alaska | Montana | Wyoming | Wyoming | Alaska | Idaho | |
| 2012 | ||||||
| Observations | 20 | 23 | 23 | 24 | 22 | 21 |
| Mean | 18.11 | 21.57 | 22.92 | 25.53 | 21.27 | 18.34 |
| Std. Dev. | 7.45 | 8.22 | 6.32 | 6.72 | 4.88 | 3.79 |
| Minimum | 10.8 | 13.7 | 14 | 17.6 | 14.8 | 13.8 |
| Alabama, Louisiana | Texas | North Carolina | Georgia, | Louisiana | West Virginia | |
| Maximum | 43.3 | 45.6 | 39.6 | 45.6 | 32.7 | 31.8 |
| Alaska | Wyoming | Wyoming | Wyoming | Montana | Wyoming | |
| 2016 | ||||||
| Observations | 27 | 30 | 30 | 30 | 27 | 27 |
| Mean | 21.21 | 22.51 | 24.13 | 24.94 | 20.81 | 18.77 |
| Std. Dev. | 8.85 | 7.04 | 7.7 | 6.15 | 3.28 | 5.24 |
| Minimum | 13.2 | 14.2 | 15 | 17.6 | 15.8 | 9.8 |
| Florida | North Carolina | Georgia | Mississippi | Nebraska | Nebraska | |
| Maximum | 61 | 44.4 | 39.6 | 40.5 | 28.2 | 36.4 |
| Alaska | Montana | South Dakota | Wyoming | Montana | Wyoming |