| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
0.7%
|
| -8 | Refusal (spontaneous) | 37 |
2.8%
|
| 8 | 56 |
4.2%
|
|
| 10 | 5 |
0.4%
|
|
| 12 | 1 |
0.1%
|
|
| 15 | 2 |
0.2%
|
|
| 16 | 1209 |
91.5%
|
|
| 19 | 1 |
0.1%
|
|
| 20 | 2 |
0.2%
|