| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
17.2%
|
| 2000 | 2 |
2.3%
|
|
| 2002 | 1 |
1.1%
|
|
| 2003 | 1 |
1.1%
|
|
| 2006 | 1 |
1.1%
|
|
| 2009 | 1 |
1.1%
|
|
| 2010 | 4 |
4.6%
|
|
| 2013 | 3 |
3.4%
|
|
| 2014 | 4 |
4.6%
|
|
| 2015 | 2 |
2.3%
|
|
| 2016 | 1 |
1.1%
|
|
| 2017 | 3 |
3.4%
|
|
| 2018 | 4 |
4.6%
|
|
| 2019 | 6 |
6.9%
|
|
| 2020 | 4 |
4.6%
|
|
| 2021 | 8 |
9.2%
|
|
| 2022 | 12 |
13.8%
|
|
| 2023 | 14 |
16.1%
|
|
| 2024 | 1 |
1.1%
|
|
| Sysmiss | 278 |