| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 19 |
1%
|
|
| 2018 | 193 |
9.8%
|
|
| 2019 | 175 |
8.9%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1579 |
80.3%
|