| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 171880 |
99%
|
| 2 | Yes, some difficulty | 1363 |
0.8%
|
| 3 | Yes, a lot of difficulty | 228 |
0.1%
|
| 4 | Cannot do at all | 118 |
0.1%
|
| Sysmiss | 23364 |