| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
6.2%
|
| 1971 | 1 |
0.5%
|
|
| 1983 | 1 |
0.5%
|
|
| 2000 | 1 |
0.5%
|
|
| 2010 | 1 |
0.5%
|
|
| 2012 | 1 |
0.5%
|
|
| 2013 | 1 |
0.5%
|
|
| 2015 | 5 |
2.6%
|
|
| 2017 | 1 |
0.5%
|
|
| 2018 | 6 |
3.1%
|
|
| 2019 | 7 |
3.6%
|
|
| 2020 | 29 |
14.9%
|
|
| 2021 | 25 |
12.9%
|
|
| 2022 | 58 |
29.9%
|
|
| 2023 | 45 |
23.2%
|
|
| Sysmiss | 429 |