| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 39 |
1%
|
|
| 2016 | 1099 |
28.8%
|
|
| 2017 | 1462 |
38.3%
|
|
| 2018 | 1216 |
31.9%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 1 |
0%
|
| Sysmiss | 34629 |