| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 505931 |
97.8%
|
| 2 | Some difficulty | 6656 |
1.3%
|
| 3 | A lot of difficulty | 1774 |
0.3%
|
| 4 | Cannot do at all | 1305 |
0.3%
|
| 9 | Don't know | 1461 |
0.3%
|
| Sysmiss | 88895 |