| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 2 |
0.1%
|
|
| 2017 | 279 |
9.5%
|
|
| 2018 | 437 |
14.9%
|
|
| 2019 | 339 |
11.6%
|
|
| 9999 | NO RESPONSE | 3 |
0.1%
|
| Sysmiss | 1865 |
63.8%
|