| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 3 |
0.3%
|
|
| 2018 | 25 |
2.3%
|
|
| 2019 | 39 |
3.6%
|
|
| 9999 | NO RESPONSE | 3 |
0.3%
|
| Sysmiss | 1026 |
93.6%
|