| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.4%
|
| 0 | 910 |
88.9%
|
|
| 5 | 1 |
0.1%
|
|
| 10 | 16 |
1.6%
|
|
| 15 | 2 |
0.2%
|
|
| 20 | 27 |
2.6%
|
|
| 25 | 2 |
0.2%
|
|
| 30 | 19 |
1.9%
|
|
| 40 | 4 |
0.4%
|
|
| 50 | 28 |
2.7%
|
|
| 60 | 2 |
0.2%
|
|
| 70 | 1 |
0.1%
|
|
| 75 | 1 |
0.1%
|
|
| 80 | 2 |
0.2%
|
|
| 100 | 5 |
0.5%
|