| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
7%
|
| 2010 | 1 |
2.3%
|
|
| 2015 | 1 |
2.3%
|
|
| 2016 | 2 |
4.7%
|
|
| 2017 | 1 |
2.3%
|
|
| 2018 | 5 |
11.6%
|
|
| 2019 | 4 |
9.3%
|
|
| 2020 | 3 |
7%
|
|
| 2021 | 12 |
27.9%
|
|
| 2022 | 9 |
20.9%
|
|
| 2023 | 2 |
4.7%
|
|
| Sysmiss | 110 |