| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3134832 |
74.1%
|
| 2 | Some difficulty | 88185 |
2.1%
|
| 3 | A lot of difficulty | 28560 |
0.7%
|
| 4 | Cannot do at all | 6917 |
0.2%
|
| 5 | Do not know | 2319 |
0.1%
|
| 8 | Not applicable | 376237 |
8.9%
|
| 9 | Unspecified | 593742 |
14%
|