| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 35 |
3.2%
|
|
| 2018 | 85 |
7.8%
|
|
| 2019 | 66 |
6%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 909 |
82.9%
|