| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 22 |
6.1%
|
| -8 | Refusal (spontaneous) | 8 |
2.2%
|
| 0 | 1 |
0.3%
|
|
| 2 | 1 |
0.3%
|
|
| 3 | 1 |
0.3%
|
|
| 9 | 2 |
0.6%
|
|
| 10 | 306 |
85%
|
|
| 15 | 2 |
0.6%
|
|
| 17 | 12 |
3.3%
|
|
| 20 | 1 |
0.3%
|
|
| 49 | 1 |
0.3%
|
|
| 50 | 1 |
0.3%
|
|
| 60 | 2 |
0.6%
|