| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 9 |
0.7%
|
|
| 2017 | 226 |
16.4%
|
|
| 2018 | 183 |
13.3%
|
|
| 2019 | 323 |
23.4%
|
|
| 9999 | NO RESPONSE | 17 |
1.2%
|
| Sysmiss | 620 |
45%
|