| Value | Category | Cases | |
|---|---|---|---|
| 12 | 12 | 37 |
3.1%
|
| 13 | 13 | 18 |
1.5%
|
| 14 | 14 | 29 |
2.4%
|
| 15 | 15 | 192 |
16.1%
|
| 16 | 16 | 61 |
5.1%
|
| 17 | 17 | 60 |
5%
|
| 18 | 18 | 457 |
38.2%
|
| 19 | 19 | 50 |
4.2%
|
| 20 | 20 | 79 |
6.6%
|
| 21 | 21 | 213 |
17.8%
|
| -4 | Not asked | 0 | |
| -3 | Not applicable | 8 | |
| -2 | No answer | 0 |