| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
2.4%
|
| 2004 | 2 |
2.4%
|
|
| 2005 | 2 |
2.4%
|
|
| 2008 | 1 |
1.2%
|
|
| 2009 | 2 |
2.4%
|
|
| 2010 | 1 |
1.2%
|
|
| 2011 | 3 |
3.5%
|
|
| 2012 | 2 |
2.4%
|
|
| 2013 | 2 |
2.4%
|
|
| 2014 | 3 |
3.5%
|
|
| 2015 | 3 |
3.5%
|
|
| 2016 | 6 |
7.1%
|
|
| 2017 | 6 |
7.1%
|
|
| 2018 | 7 |
8.2%
|
|
| 2019 | 12 |
14.1%
|
|
| 2020 | 5 |
5.9%
|
|
| 2021 | 3 |
3.5%
|
|
| 2022 | 8 |
9.4%
|
|
| 2023 | 11 |
12.9%
|
|
| 2024 | 4 |
4.7%
|
|
| Sysmiss | 70 |