| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1629 |
15.3%
|
| 1 | Lower | 1213 |
11.4%
|
| 2 | Roughly the same | 6798 |
63.7%
|
| 3 | Higher | 1032 |
9.7%
|