| Value | Category | Cases | |
|---|---|---|---|
| 17 | 34 |
1.5%
|
|
| 18 | 137 |
6.2%
|
|
| 19 | 352 |
15.8%
|
|
| 20 | 1666 |
74.9%
|
|
| 21 | 35 |
1.6%
|
|
| Sysmiss | 38 |