| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 535 |
35%
|
| 1 | has certificate | 814 |
53.3%
|
| 2 | registered | 154 |
10.1%
|
| 8 | don't know | 11 |
0.7%
|
| 9 | 13 |
0.9%
|
|
| 11 | .Z | 14140 |