| Value | Category | Cases | |
|---|---|---|---|
| 0 | 36 |
25%
|
|
| 15 | 12 |
8.3%
|
|
| 17 | 3 |
2.1%
|
|
| 18 | 14 |
9.7%
|
|
| 19 | 44 |
30.6%
|
|
| 20 | 35 |
24.3%
|
|
| Sysmiss | 9 |