| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 2 |
0.1%
|
| 1 | Very easy | 121 |
5%
|
| 2 | Easy | 282 |
11.7%
|
| 3 | Difficult | 813 |
33.8%
|
| 4 | Very difficult | 907 |
37.7%
|
| 7 | Don't have to pay taxes | 97 |
4%
|
| 9 | Don't know | 185 |
7.7%
|
| 998 | Refused | 0 |
0%
|