| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 952 |
5.3%
|
| 2010 | 9 |
0%
|
|
| 2011 | 246 |
1.4%
|
|
| 2012 | 804 |
4.4%
|
|
| 2013 | 1310 |
7.2%
|
|
| 2014 | 448 |
2.5%
|
|
| 4444 | Marked on card | 45 |
0.2%
|
| Sysmiss | 14294 |
78.9%
|