| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 180108 |
98.5%
|
| 2 | Yes, some difficulty | 2228 |
1.2%
|
| 3 | Yes, a lot of difficulty | 332 |
0.2%
|
| 4 | Cannot do at all | 147 |
0.1%
|
| Sysmiss | 27128 |