| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3152356 |
74.5%
|
| 2 | Some difficulty | 84212 |
2%
|
| 3 | A lot of difficulty | 18975 |
0.4%
|
| 4 | Cannot do at all | 2502 |
0.1%
|
| 5 | Do not know | 2762 |
0.1%
|
| 8 | Not applicable | 376237 |
8.9%
|
| 9 | Unspecified | 593748 |
14%
|