| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 152922 |
98.6%
|
| 2 | Some difficulty | 1646 |
1.1%
|
| 3 | A lot of difficulty | 387 |
0.2%
|
| 4 | Cannot do at all | 151 |
0.1%
|
| 11 | .A | 574 |