| Value | Category | Cases | |
|---|---|---|---|
| 0 | NOT GIVEN | 510 |
8.1%
|
| 2016 | 604 |
9.6%
|
|
| 2017 | 708 |
11.3%
|
|
| 2018 | 659 |
10.5%
|
|
| 4444 | MARKED ON CARD | 34 |
0.5%
|
| Sysmiss | 3754 |
59.9%
|