| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
7.1%
|
| 2000 | 2 |
4.8%
|
|
| 2006 | 1 |
2.4%
|
|
| 2008 | 2 |
4.8%
|
|
| 2010 | 1 |
2.4%
|
|
| 2012 | 1 |
2.4%
|
|
| 2014 | 1 |
2.4%
|
|
| 2015 | 1 |
2.4%
|
|
| 2016 | 1 |
2.4%
|
|
| 2018 | 3 |
7.1%
|
|
| 2019 | 2 |
4.8%
|
|
| 2020 | 10 |
23.8%
|
|
| 2021 | 5 |
11.9%
|
|
| 2022 | 9 |
21.4%
|
|
| Sysmiss | 167 |