| Value | Category | Cases | |
|---|---|---|---|
| 2 | 1 |
1.6%
|
|
| 17 | 30 |
48.4%
|
|
| 18 | 19 |
30.6%
|
|
| 19 | 8 |
12.9%
|
|
| 20 | 4 |
6.5%
|
|
| Sysmiss | 1604 |