| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
6.5%
|
| 2000 | 1 |
1.1%
|
|
| 2005 | 1 |
1.1%
|
|
| 2009 | 1 |
1.1%
|
|
| 2010 | 3 |
3.2%
|
|
| 2012 | 1 |
1.1%
|
|
| 2013 | 1 |
1.1%
|
|
| 2015 | 3 |
3.2%
|
|
| 2016 | 3 |
3.2%
|
|
| 2017 | 1 |
1.1%
|
|
| 2018 | 3 |
3.2%
|
|
| 2019 | 7 |
7.5%
|
|
| 2020 | 5 |
5.4%
|
|
| 2021 | 9 |
9.7%
|
|
| 2022 | 15 |
16.1%
|
|
| 2023 | 29 |
31.2%
|
|
| 2024 | 4 |
4.3%
|
|
| Sysmiss | 932 |