| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 136 |
8.7%
|
|
| 2017 | 260 |
16.6%
|
|
| 2018 | 244 |
15.6%
|
|
| 2019 | 5 |
0.3%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 917 |
58.6%
|