| Value | Category | Cases | |
|---|---|---|---|
| 0 | no | 1778 |
47.2%
|
| 1 | yes | 1983 |
52.7%
|
| 8 | don't know year | 0 |
0%
|
| 9 | 2 |
0.1%
|
|
| 11 | .Z | 14991 |