| Value | Category | Cases | |
|---|---|---|---|
| 0 | NOT GIVEN | 77 |
2.2%
|
| 2016 | 10 |
0.3%
|
|
| 2017 | 22 |
0.6%
|
|
| 2018 | 4 |
0.1%
|
|
| Sysmiss | 3361 |
96.7%
|