| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 18 |
0.8%
|
|
| 2017 | 72 |
3.3%
|
|
| 2018 | 152 |
6.9%
|
|
| 2019 | 4 |
0.2%
|
|
| 9999 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 1942 |
88.7%
|