| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 2654649 |
79.7%
|
| 2 | Some difficulty | 281870 |
8.5%
|
| 3 | A lot of difficulty | 59346 |
1.8%
|
| 4 | Can not do at all | 4825 |
0.1%
|
| 5 | Do not know | 974 |
0%
|
| 8 | Not applicable | 325657 |
9.8%
|
| 9 | Unspecified | 1546 |
0%
|