| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 150921 |
97.3%
|
| 2 | Some difficulty | 3203 |
2.1%
|
| 3 | A lot of difficulty | 862 |
0.6%
|
| 4 | Cannot do at all | 145 |
0.1%
|
| 11 | .A | 549 |