| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 1 |
0%
|
|
| 2016 | 282 |
7.9%
|
|
| 2017 | 297 |
8.3%
|
|
| 2018 | 152 |
4.3%
|
|
| 9997 | 8 |
0.2%
|
|
| 9999 | NO RESPONSE | 18 |
0.5%
|
| Sysmiss | 2802 |
78.7%
|