| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 |
12.5%
|
|
| 7 | 1 |
12.5%
|
|
| 17 | 1 |
12.5%
|
|
| 20 | 1 |
12.5%
|
|
| 77 | Don't know | 4 |
50%
|
| Sysmiss | 3461 |