| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
3.6%
|
| 0 | 80 |
72.1%
|
|
| 10 | 1 |
0.9%
|
|
| 20 | 8 |
7.2%
|
|
| 30 | 1 |
0.9%
|
|
| 40 | 1 |
0.9%
|
|
| 90 | 1 |
0.9%
|
|
| 100 | 15 |
13.5%
|