| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3205143 |
75.8%
|
| 2 | Some difficulty | 42555 |
1%
|
| 3 | A lot of difficulty | 7563 |
0.2%
|
| 4 | Cannot do at all | 3296 |
0.1%
|
| 5 | Do not know | 2267 |
0.1%
|
| 8 | Not applicable | 376237 |
8.9%
|
| 9 | Unspecified | 593731 |
14%
|