| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 842 |
0.5%
|
| 2 | yes, can do with a lot of difficulty | 919 |
0.6%
|
| 3 | yes, can do with some difficulty | 2741 |
1.7%
|
| 4 | yes, can do with no difficulty | 153226 |
96.8%
|
| 8 | don't know | 555 |
0.4%
|
| Sysmiss | 4176 |