| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.4%
|
| 0 | 992 |
96.9%
|
|
| 10 | 10 |
1%
|
|
| 20 | 9 |
0.9%
|
|
| 30 | 2 |
0.2%
|
|
| 50 | 5 |
0.5%
|
|
| 70 | 1 |
0.1%
|
|
| 95 | 1 |
0.1%
|