| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 487843 |
94.3%
|
| 2 | Some difficulty | 20064 |
3.9%
|
| 3 | A lot of difficulty | 6381 |
1.2%
|
| 4 | Cannot do at all | 1360 |
0.3%
|
| 9 | Don't know | 1479 |
0.3%
|
| Sysmiss | 88895 |