| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 17 |
0.8%
|
| 1 | yes | 2206 |
98%
|
| 8 | don't know | 25 |
1.1%
|
| 9 | 2 |
0.1%
|
|
| 11 | .Z | 5989 |