| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 2 |
0.1%
|
|
| 2017 | 105 |
7.6%
|
|
| 2018 | 128 |
9.3%
|
|
| 2019 | 172 |
12.5%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 970 |
70.4%
|