| Value | Category | Cases | |
|---|---|---|---|
| 0 | missing | 4000 |
68.3%
|
| 2011 | 204 |
3.5%
|
|
| 2012 | 739 |
12.6%
|
|
| 2013 | 771 |
13.2%
|
|
| 4444 | Marked on card | 122 |
2.1%
|
| 9998 | DK | 17 |
0.3%
|
| Sysmiss | 284 |