| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 8 |
66.7%
|
| 1 | has certificate | 3 |
25%
|
| 2 | registered | 1 |
8.3%
|
| 8 | don't know | 0 |
0%
|
| 11 | .Z | 15655 |