| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 10 |
0.3%
|
|
| 2016 | 928 |
26.4%
|
|
| 2017 | 1389 |
39.5%
|
|
| 2018 | 1186 |
33.8%
|
|
| 9997 | inconsistent | 1 |
0%
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 34932 |