| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 1 | Very easy | 13 |
1.1%
|
| 2 | Easy | 105 |
8.8%
|
| 3 | Difficult | 438 |
36.5%
|
| 4 | Very difficult | 421 |
35.1%
|
| 7 | Don't have to pay taxes | 95 |
7.9%
|
| 9 | Don't know | 127 |
10.6%
|
| 998 | Refused | 0 |
0%
|