| Value | Category | Cases | |
|---|---|---|---|
| 1 | Much higher | 883 |
4.5%
|
| 2 | Higher | 3102 |
15.8%
|
| 3 | More or less the same | 6136 |
31.2%
|
| 4 | Lower | 6562 |
33.4%
|
| 5 | Much lower | 2960 |
15.1%
|
| 9 | Unspecified | 6 |
0%
|