| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
5.6%
|
| 1997 | 1 |
0.8%
|
|
| 2000 | 2 |
1.6%
|
|
| 2003 | 1 |
0.8%
|
|
| 2010 | 2 |
1.6%
|
|
| 2014 | 1 |
0.8%
|
|
| 2015 | 2 |
1.6%
|
|
| 2017 | 2 |
1.6%
|
|
| 2018 | 6 |
4.8%
|
|
| 2019 | 5 |
4%
|
|
| 2020 | 14 |
11.1%
|
|
| 2021 | 15 |
11.9%
|
|
| 2022 | 46 |
36.5%
|
|
| 2023 | 22 |
17.5%
|
|
| Sysmiss | 234 |