| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 148492 |
95.7%
|
| 2 | Some difficulty | 4599 |
3%
|
| 3 | A lot of difficulty | 1737 |
1.1%
|
| 4 | Cannot do at all | 303 |
0.2%
|
| 11 | .A | 549 |