| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
1.7%
|
| 2000 | 1 |
0.2%
|
|
| 2001 | 1 |
0.2%
|
|
| 2004 | 1 |
0.2%
|
|
| 2005 | 1 |
0.2%
|
|
| 2008 | 1 |
0.2%
|
|
| 2009 | 3 |
0.5%
|
|
| 2010 | 1 |
0.2%
|
|
| 2012 | 4 |
0.7%
|
|
| 2015 | 5 |
0.9%
|
|
| 2016 | 8 |
1.4%
|
|
| 2017 | 12 |
2.1%
|
|
| 2018 | 17 |
2.9%
|
|
| 2019 | 32 |
5.5%
|
|
| 2020 | 183 |
31.7%
|
|
| 2021 | 103 |
17.9%
|
|
| 2022 | 108 |
18.7%
|
|
| 2023 | 85 |
14.7%
|
|
| 2024 | 1 |
0.2%
|
|
| Sysmiss | 430 |