| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 1 |
3.7%
|
|
| 2017 | 2 |
7.4%
|
|
| 2018 | 6 |
22.2%
|
|
| 2019 | 17 |
63%
|
|
| 2020 | 1 |
3.7%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 12922 |