| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
3.7%
|
| 0 | No time was spent | 11 |
2.7%
|
| 1 | 13 |
3.2%
|
|
| 2 | 6 |
1.5%
|
|
| 3 | 3 |
0.7%
|
|
| 5 | 54 |
13.4%
|
|
| 7 | 1 |
0.2%
|
|
| 8 | 3 |
0.7%
|
|
| 10 | 99 |
24.5%
|
|
| 12 | 3 |
0.7%
|
|
| 15 | 45 |
11.1%
|
|
| 20 | 96 |
23.8%
|
|
| 25 | 12 |
3%
|
|
| 30 | 28 |
6.9%
|
|
| 40 | 4 |
1%
|
|
| 50 | 5 |
1.2%
|
|
| 60 | 1 |
0.2%
|
|
| 70 | 1 |
0.2%
|
|
| 80 | 3 |
0.7%
|
|
| 90 | 1 |
0.2%
|