| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 191 |
12.2%
|
|
| 2017 | 268 |
17.1%
|
|
| 2018 | 257 |
16.4%
|
|
| 2019 | 7 |
0.4%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 839 |
53.6%
|