| Value | Category | Cases | |
|---|---|---|---|
| 15 | 7 |
2.4%
|
|
| 16 | 8 |
2.7%
|
|
| 17 | 35 |
11.9%
|
|
| 18 | 120 |
40.8%
|
|
| 19 | 43 |
14.6%
|
|
| 20 | 18 |
6.1%
|
|
| 21 | 9 |
3.1%
|
|
| 22 | 1 |
0.3%
|
|
| 23 | 1 |
0.3%
|
|
| 25 | 1 |
0.3%
|
|
| Sysmiss | 51 |