| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
5.6%
|
| 2008 | 1 |
0.4%
|
|
| 2011 | 1 |
0.4%
|
|
| 2013 | 1 |
0.4%
|
|
| 2014 | 1 |
0.4%
|
|
| 2015 | 1 |
0.4%
|
|
| 2016 | 7 |
3%
|
|
| 2017 | 5 |
2.2%
|
|
| 2018 | 15 |
6.5%
|
|
| 2019 | 24 |
10.3%
|
|
| 2020 | 30 |
12.9%
|
|
| 2021 | 29 |
12.5%
|
|
| 2022 | 72 |
31%
|
|
| 2023 | 32 |
13.8%
|
|
| Sysmiss | 242 |