| Year/Age | M | s.e | 95% confidence interval | F | p | |
|---|---|---|---|---|---|---|
| Lower bound | Upper bound | |||||
| 2012 | 10.9 | 3.15 | 3.81 | 17.99 | 0.866 | 0.525 |
| 2013 | 9.3 | 3.16 | 2.19 | 16.41 | ||
| 2014 | 7.9 | 2.76 | 1.69 | 14.11 | ||
| 2015 | 12.3 | 4.01 | 3.28 | 21.32 | ||
| 2016 | 15.0 | 4.80 | 4.20 | 25.80 | ||
| 2017 | 13.0 | 4.45 | 2.99 | 23.01 | ||
| 2018 | 19.6 | 5.99 | 6.12 | 33.08 | ||
| 0-9 | 0.14 | 0.143 | 0.0 | 0.49 | 27.362 | 0.000 |
| 10-19 | 2.71 | 0.606 | 1.22 | 4.20 | ||
| 20-29 | 11.0 | 1.31 | 7.79 | 14.21 | ||
| 30-39 | 16.71 | 2.10 | 11.57 | 21.86 | ||