| Value | Category | Cases | |
|---|---|---|---|
| 0 | neither certificate or registered | 132 |
40%
|
| 1 | has certificate | 157 |
47.6%
|
| 2 | registered | 33 |
10%
|
| 8 | don't know | 6 |
1.8%
|
| 9 | 2 |
0.6%
|
|
| 11 | .Z | 15337 |