| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 16249 |
88.3%
|
| 1 | yes | 631 |
3.4%
|
| 8 | don't know | 1510 |
8.2%
|
| 9 | 3 |
0%
|
|
| 11 | .Z | 361 |