| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 41 |
3.7%
|
|
| 2018 | 100 |
9.1%
|
|
| 2019 | 59 |
5.4%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 895 |
81.7%
|