| Value | Category | Cases | |
|---|---|---|---|
| -8 | don't know | 31 |
23.1%
|
| 0 | 96 |
71.6%
|
|
| 20 | 2 |
1.5%
|
|
| 150 | 1 |
0.7%
|
|
| 200 | 1 |
0.7%
|
|
| 320 | 1 |
0.7%
|
|
| 650 | 1 |
0.7%
|
|
| 5000 | 1 |
0.7%
|
|
| Sysmiss | 6185 |