| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 15 |
1.4%
|
|
| 2017 | 77 |
7%
|
|
| 2018 | 81 |
7.4%
|
|
| 2019 | 109 |
9.9%
|
|
| 9999 | NO RESPONSE | 3 |
0.3%
|
| Sysmiss | 811 |
74%
|