| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 70 |
14.8%
|
| 2008 | 2 |
0.4%
|
|
| 2011 | 3 |
0.6%
|
|
| 2012 | 1 |
0.2%
|
|
| 2015 | 1 |
0.2%
|
|
| 2016 | 3 |
0.6%
|
|
| 2017 | 1 |
0.2%
|
|
| 2018 | 9 |
1.9%
|
|
| 2019 | 5 |
1.1%
|
|
| 2020 | 28 |
5.9%
|
|
| 2021 | 49 |
10.3%
|
|
| 2022 | 197 |
41.6%
|
|
| 2023 | 105 |
22.2%
|
|
| Sysmiss | 554 |