| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 219 |
42%
|
| 1 | has certificate | 247 |
47.4%
|
| 2 | registered | 44 |
8.4%
|
| 8 | don't know | 8 |
1.5%
|
| 9 | 3 |
0.6%
|
|
| 11 | .Z | 15146 |