| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 2542 |
14%
|
| 2010 | 1 |
0%
|
|
| 2011 | 21 |
0.1%
|
|
| 2012 | 82 |
0.5%
|
|
| 2013 | 791 |
4.4%
|
|
| 2014 | 362 |
2%
|
|
| 4444 | Marked on card | 15 |
0.1%
|
| Sysmiss | 14294 |
78.9%
|