| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
7.5%
|
| 1980 | 1 |
0.5%
|
|
| 1987 | 1 |
0.5%
|
|
| 1990 | 1 |
0.5%
|
|
| 1992 | 1 |
0.5%
|
|
| 1994 | 1 |
0.5%
|
|
| 1996 | 1 |
0.5%
|
|
| 1997 | 1 |
0.5%
|
|
| 2000 | 3 |
1.5%
|
|
| 2001 | 1 |
0.5%
|
|
| 2002 | 3 |
1.5%
|
|
| 2004 | 2 |
1%
|
|
| 2005 | 5 |
2.5%
|
|
| 2006 | 3 |
1.5%
|
|
| 2007 | 2 |
1%
|
|
| 2008 | 2 |
1%
|
|
| 2009 | 2 |
1%
|
|
| 2010 | 4 |
2%
|
|
| 2012 | 16 |
8%
|
|
| 2013 | 3 |
1.5%
|
|
| 2014 | 6 |
3%
|
|
| 2015 | 14 |
7%
|
|
| 2016 | 8 |
4%
|
|
| 2017 | 10 |
5%
|
|
| 2018 | 16 |
8%
|
|
| 2019 | 27 |
13.6%
|
|
| 2020 | 21 |
10.6%
|
|
| 2021 | 20 |
10.1%
|
|
| 2022 | 9 |
4.5%
|
|
| Sysmiss | 1441 |