| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Very easy | 88 |
3.7%
|
| 2 | Easy | 212 |
8.8%
|
| 3 | Difficult | 870 |
36.3%
|
| 4 | Very difficult | 945 |
39.4%
|
| 7 | Don't have to pay taxes | 133 |
5.5%
|
| 9 | Don't know | 152 |
6.3%
|