| Value | Category | Cases | |
|---|---|---|---|
| 2 | 1 |
1.6%
|
|
| 10 | 5 |
8.1%
|
|
| 15 | 1 |
1.6%
|
|
| 17 | 1 |
1.6%
|
|
| 20 | 3 |
4.8%
|
|
| 30 | 19 |
30.6%
|
|
| 35 | 1 |
1.6%
|
|
| 40 | 2 |
3.2%
|
|
| 45 | 1 |
1.6%
|
|
| 50 | 1 |
1.6%
|
|
| 77 | Don't know | 27 |
43.5%
|
| Sysmiss | 2045 |