| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 14 |
9.7%
|
| 2011 | 1 |
0.7%
|
|
| 2012 | 2 |
1.4%
|
|
| 2013 | 1 |
0.7%
|
|
| 2015 | 3 |
2.1%
|
|
| 2016 | 1 |
0.7%
|
|
| 2017 | 2 |
1.4%
|
|
| 2018 | 4 |
2.8%
|
|
| 2019 | 13 |
9%
|
|
| 2020 | 8 |
5.5%
|
|
| 2021 | 30 |
20.7%
|
|
| 2022 | 49 |
33.8%
|
|
| 2023 | 17 |
11.7%
|
|
| Sysmiss | 568 |