| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 2 |
0.1%
|
|
| 2016 | 97 |
2.7%
|
|
| 2017 | 348 |
9.8%
|
|
| 2018 | 727 |
20.4%
|
|
| 9997 | 7 |
0.2%
|
|
| 9999 | NO RESPONSE | 18 |
0.5%
|
| Sysmiss | 2361 |
66.3%
|