| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 76 |
45.2%
|
| 1 | has certificate | 76 |
45.2%
|
| 2 | registered | 14 |
8.3%
|
| 8 | don't know | 1 |
0.6%
|
| 9 | 1 |
0.6%
|
|
| 11 | .Z | 15499 |