| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
4.7%
|
| -8 | Refusal (spontaneous) | 5 |
3.3%
|
| 0 | 8 |
5.3%
|
|
| 1 | 1 |
0.7%
|
|
| 5 | 10 |
6.7%
|
|
| 10 | 55 |
36.7%
|
|
| 12 | 1 |
0.7%
|
|
| 13 | 1 |
0.7%
|
|
| 14 | 1 |
0.7%
|
|
| 15 | 17 |
11.3%
|
|
| 18 | 1 |
0.7%
|
|
| 20 | 18 |
12%
|
|
| 25 | 8 |
5.3%
|
|
| 30 | 6 |
4%
|
|
| 40 | 1 |
0.7%
|
|
| 50 | 5 |
3.3%
|
|
| 55 | 1 |
0.7%
|
|
| 60 | 4 |
2.7%
|