| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 1 |
0.1%
|
|
| 2017 | 2 |
0.1%
|
|
| 2018 | 3 |
0.2%
|
|
| 2019 | 1 |
0.1%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1959 |
99.6%
|