| Value | Category | Cases | |
|---|---|---|---|
| 12 | 12 | 73 |
3.2%
|
| 13 | 13 | 59 |
2.6%
|
| 14 | 14 | 87 |
3.8%
|
| 15 | 15 | 95 |
4.1%
|
| 16 | 16 | 161 |
7%
|
| 17 | 17 | 356 |
15.5%
|
| 18 | 18 | 463 |
20.1%
|
| 19 | 19 | 149 |
6.5%
|
| 20 | 20 | 109 |
4.7%
|
| 21 | 21 | 751 |
32.6%
|
| -4 | Not asked | 0 | |
| -3 | Not applicable | 22 | |
| -2 | No answer | 0 |