| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 0 |
0%
|
| -8 | Refusal | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 2012 | 90 |
42.7%
|
|
| 2013 | 121 |
57.3%
|
|
| Sysmiss | 875 |