| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 492370 |
95.2%
|
| 2 | Some difficulty | 18654 |
3.6%
|
| 3 | A lot of difficulty | 3908 |
0.8%
|
| 4 | Cannot do at all | 682 |
0.1%
|
| 9 | Don't know | 1513 |
0.3%
|
| Sysmiss | 88895 |