| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 36 |
35%
|
| -8 | Refusal (spontaneous) | 5 |
4.9%
|
| 0 | 8 |
7.8%
|
|
| 1 | 1 |
1%
|
|
| 2 | 3 |
2.9%
|
|
| 3 | 1 |
1%
|
|
| 5 | 4 |
3.9%
|
|
| 7 | 1 |
1%
|
|
| 8 | 1 |
1%
|
|
| 13 | 1 |
1%
|
|
| 15 | 19 |
18.4%
|
|
| 20 | 7 |
6.8%
|
|
| 25 | 11 |
10.7%
|
|
| 30 | 2 |
1.9%
|
|
| 31 | 1 |
1%
|
|
| 33 | 1 |
1%
|
|
| 40 | 1 |
1%
|