| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 433 |
37%
|
| 1 | has certificate | 592 |
50.6%
|
| 2 | registered | 116 |
9.9%
|
| 8 | don't know | 22 |
1.9%
|
| 9 | 6 |
0.5%
|
|
| 11 | .Z | 14498 |