| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 58 |
14.9%
|
| -8 | Refusal (spontaneous) | 136 |
35.1%
|
| 12 | 1 |
0.3%
|
|
| 15 | 3 |
0.8%
|
|
| 20 | 2 |
0.5%
|
|
| 23 | 131 |
33.8%
|
|
| 25 | 8 |
2.1%
|
|
| 30 | 3 |
0.8%
|
|
| 45 | 3 |
0.8%
|
|
| 50 | 41 |
10.6%
|
|
| 55 | 1 |
0.3%
|
|
| 60 | 1 |
0.3%
|