| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 2 |
0.1%
|
|
| 2017 | 168 |
10.7%
|
|
| 2018 | 199 |
12.7%
|
|
| 2019 | 17 |
1.1%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 1176 |
75.2%
|