| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
10.8%
|
| 0 | 89 |
80.2%
|
|
| 1 | 1 |
0.9%
|
|
| 10 | 3 |
2.7%
|
|
| 20 | 2 |
1.8%
|
|
| 60 | 1 |
0.9%
|
|
| 80 | 1 |
0.9%
|
|
| 100 | 2 |
1.8%
|