| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 1 |
0.1%
|
| 1 | Very easy | 41 |
3.4%
|
| 2 | Easy | 77 |
6.4%
|
| 3 | Difficult | 544 |
45.3%
|
| 4 | Very difficult | 377 |
31.4%
|
| 7 | Don't have to pay taxes | 6 |
0.5%
|
| 9 | Don't know | 154 |
12.8%
|
| 998 | Refused | 0 |
0%
|