| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 1948 |
10.8%
|
| 2010 | 2 |
0%
|
|
| 2011 | 38 |
0.2%
|
|
| 2012 | 510 |
2.8%
|
|
| 2013 | 967 |
5.3%
|
|
| 2014 | 320 |
1.8%
|
|
| 4444 | Marked on card | 29 |
0.2%
|
| Sysmiss | 14294 |
78.9%
|