| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1 |
5%
|
|
| 4 | 1 |
5%
|
|
| 8 | 1 |
5%
|
|
| 9 | 2 |
10%
|
|
| 12 | 1 |
5%
|
|
| 20 | 2 |
10%
|
|
| 28 | 1 |
5%
|
|
| 38 | 1 |
5%
|
|
| 77 | Don't know | 10 |
50%
|
| Sysmiss | 2136 |