| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 14 |
53.8%
|
| 1 | has certificate | 10 |
38.5%
|
| 2 | registered | 2 |
7.7%
|
| 8 | don't know | 0 |
0%
|
| 11 | .Z | 15641 |