| Value | Category | Cases | |
|---|---|---|---|
| 0 | missing | 4306 |
73.6%
|
| 2012 | 130 |
2.2%
|
|
| 2013 | 1397 |
23.9%
|
|
| 4444 | Marked on card | 14 |
0.2%
|
| 9998 | DK | 6 |
0.1%
|
| Sysmiss | 284 |