| Value | Category | Cases | |
|---|---|---|---|
| -2 | Refusal to answer | 0 |
0%
|
| -1 | Don't know | 0 |
0%
|
| 0 | 1 |
20%
|
|
| 480 | 1 |
20%
|
|
| 670 | 1 |
20%
|
|
| 2400 | 1 |
20%
|
|
| 13000 | 1 |
20%
|