| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 0 |
0%
|
| 2 | yes, can do with a lot of difficulty | 1 |
0.2%
|
| 3 | yes, can do with some difficulty | 5 |
1.2%
|
| 4 | yes, can do with no difficulty | 407 |
98.3%
|
| 8 | don't know | 1 |
0.2%
|
| Sysmiss | 44200 |