| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 957 |
5.3%
|
| 2010 | 11 |
0.1%
|
|
| 2011 | 242 |
1.3%
|
|
| 2012 | 797 |
4.4%
|
|
| 2013 | 1317 |
7.3%
|
|
| 2014 | 446 |
2.5%
|
|
| 4444 | Marked on card | 44 |
0.2%
|
| Sysmiss | 14294 |
78.9%
|