| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
3.9%
|
| 1998 | 2 |
3.9%
|
|
| 2000 | 1 |
2%
|
|
| 2003 | 1 |
2%
|
|
| 2006 | 1 |
2%
|
|
| 2010 | 2 |
3.9%
|
|
| 2014 | 1 |
2%
|
|
| 2015 | 1 |
2%
|
|
| 2017 | 5 |
9.8%
|
|
| 2018 | 7 |
13.7%
|
|
| 2019 | 5 |
9.8%
|
|
| 2020 | 5 |
9.8%
|
|
| 2021 | 2 |
3.9%
|
|
| 2022 | 5 |
9.8%
|
|
| 2023 | 7 |
13.7%
|
|
| 2024 | 4 |
7.8%
|
|
| Sysmiss | 260 |