| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
0.7%
|
| 0 | 428 |
71%
|
|
| 5 | 1 |
0.2%
|
|
| 10 | 16 |
2.7%
|
|
| 15 | 6 |
1%
|
|
| 20 | 46 |
7.6%
|
|
| 25 | 16 |
2.7%
|
|
| 30 | 30 |
5%
|
|
| 35 | 2 |
0.3%
|
|
| 40 | 7 |
1.2%
|
|
| 50 | 28 |
4.6%
|
|
| 55 | 1 |
0.2%
|
|
| 60 | 7 |
1.2%
|
|
| 70 | 3 |
0.5%
|
|
| 75 | 1 |
0.2%
|
|
| 80 | 5 |
0.8%
|
|
| 85 | 1 |
0.2%
|
|
| 90 | 1 |
0.2%
|