| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 23 |
36.5%
|
| 2000 | 1 |
1.6%
|
|
| 2004 | 2 |
3.2%
|
|
| 2005 | 1 |
1.6%
|
|
| 2006 | 1 |
1.6%
|
|
| 2010 | 1 |
1.6%
|
|
| 2011 | 1 |
1.6%
|
|
| 2015 | 5 |
7.9%
|
|
| 2017 | 1 |
1.6%
|
|
| 2018 | 7 |
11.1%
|
|
| 2019 | 2 |
3.2%
|
|
| 2020 | 9 |
14.3%
|
|
| 2021 | 6 |
9.5%
|
|
| 2022 | 3 |
4.8%
|
|
| Sysmiss | 88 |