| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 1 | Very easy | 16 |
1.3%
|
| 2 | Easy | 128 |
10.7%
|
| 3 | Difficult | 403 |
33.6%
|
| 4 | Very difficult | 244 |
20.3%
|
| 7 | Don't have to pay taxes | 64 |
5.3%
|
| 9 | Don't know | 344 |
28.7%
|
| 998 | Refused | 0 |
0%
|