| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 2002 | 1 |
0.6%
|
|
| 2003 | 1 |
0.6%
|
|
| 2005 | 5 |
3.2%
|
|
| 2006 | 8 |
5.1%
|
|
| 2007 | 4 |
2.5%
|
|
| 2008 | 7 |
4.5%
|
|
| 2009 | 4 |
2.5%
|
|
| 2010 | 22 |
14%
|
|
| 2011 | 13 |
8.3%
|
|
| 2012 | 21 |
13.4%
|
|
| 2013 | 14 |
8.9%
|
|
| 2014 | 7 |
4.5%
|
|
| 2015 | 6 |
3.8%
|
|
| 2016 | 9 |
5.7%
|
|
| 2017 | 3 |
1.9%
|
|
| 2018 | 11 |
7%
|
|
| 2019 | 5 |
3.2%
|
|
| 2020 | 3 |
1.9%
|
|
| 2021 | 5 |
3.2%
|
|
| 2022 | 3 |
1.9%
|
|
| 2023 | 5 |
3.2%
|