| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 21 |
1.8%
|
|
| 2017 | 466 |
39.8%
|
|
| 2018 | 679 |
58%
|
|
| 9997 | inconsistent | 3 |
0.3%
|
| 9998 | don't know | 1 |
0.1%
|
| Sysmiss | 37276 |