| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 37 |
1%
|
|
| 2016 | 1079 |
28.6%
|
|
| 2017 | 1451 |
38.4%
|
|
| 2018 | 1208 |
32%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 34671 |