| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 139 |
5.3%
|
|
| 2016 | 724 |
27.5%
|
|
| 2017 | 947 |
35.9%
|
|
| 2018 | 826 |
31.3%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 35810 |