| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 32 |
0.9%
|
|
| 2016 | 989 |
27.5%
|
|
| 2017 | 1388 |
38.7%
|
|
| 2018 | 1181 |
32.9%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 1 |
0%
|
| Sysmiss | 34855 |