| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 7065 |
92.1%
|
| 1 | yes | 591 |
7.7%
|
| 8 | don't know | 10 |
0.1%
|
| 9 | 8 |
0.1%
|
|
| 11 | .Z | 29837 |