| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not given | 412 |
29.3%
|
| 2011 | 4 |
0.3%
|
|
| 2012 | 270 |
19.2%
|
|
| 2013 | 404 |
28.7%
|
|
| 2014 | 312 |
22.2%
|
|
| 4444 | Marked on card | 2 |
0.1%
|
| 9997 | Inconsistent | 2 |
0.1%
|
| 9998 | DK | 0 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 1322 |