| Value | Category | Cases | |
|---|---|---|---|
| 0 | NOT GIVEN | 84 |
2.4%
|
| 2015 | 5 |
0.1%
|
|
| 2016 | 10 |
0.3%
|
|
| 2017 | 11 |
0.3%
|
|
| 2018 | 3 |
0.1%
|
|
| Sysmiss | 3361 |
96.7%
|