| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
4.8%
|
| 0 | 217 |
80.1%
|
|
| 15 | 1 |
0.4%
|
|
| 20 | 3 |
1.1%
|
|
| 30 | 3 |
1.1%
|
|
| 50 | 4 |
1.5%
|
|
| 75 | 1 |
0.4%
|
|
| 100 | 29 |
10.7%
|