| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 43 |
18.5%
|
| 1966 | 1 |
0.4%
|
|
| 1997 | 1 |
0.4%
|
|
| 2000 | 1 |
0.4%
|
|
| 2001 | 1 |
0.4%
|
|
| 2004 | 1 |
0.4%
|
|
| 2006 | 1 |
0.4%
|
|
| 2007 | 1 |
0.4%
|
|
| 2008 | 1 |
0.4%
|
|
| 2009 | 1 |
0.4%
|
|
| 2012 | 1 |
0.4%
|
|
| 2013 | 1 |
0.4%
|
|
| 2015 | 4 |
1.7%
|
|
| 2016 | 7 |
3%
|
|
| 2017 | 15 |
6.4%
|
|
| 2018 | 17 |
7.3%
|
|
| 2019 | 15 |
6.4%
|
|
| 2020 | 17 |
7.3%
|
|
| 2021 | 31 |
13.3%
|
|
| 2022 | 54 |
23.2%
|
|
| 2023 | 19 |
8.2%
|
|
| Sysmiss | 769 |