| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 22 |
3.1%
|
| 1973 | 1 |
0.1%
|
|
| 1975 | 1 |
0.1%
|
|
| 1977 | 1 |
0.1%
|
|
| 1979 | 1 |
0.1%
|
|
| 1980 | 1 |
0.1%
|
|
| 1983 | 1 |
0.1%
|
|
| 1986 | 1 |
0.1%
|
|
| 1987 | 1 |
0.1%
|
|
| 1988 | 1 |
0.1%
|
|
| 1989 | 4 |
0.6%
|
|
| 1990 | 7 |
1%
|
|
| 1992 | 2 |
0.3%
|
|
| 1993 | 2 |
0.3%
|
|
| 1994 | 1 |
0.1%
|
|
| 1995 | 5 |
0.7%
|
|
| 1996 | 4 |
0.6%
|
|
| 1997 | 2 |
0.3%
|
|
| 1998 | 11 |
1.5%
|
|
| 1999 | 7 |
1%
|
|
| 2000 | 22 |
3.1%
|
|
| 2001 | 6 |
0.8%
|
|
| 2002 | 8 |
1.1%
|
|
| 2003 | 8 |
1.1%
|
|
| 2004 | 11 |
1.5%
|
|
| 2005 | 19 |
2.7%
|
|
| 2006 | 7 |
1%
|
|
| 2007 | 10 |
1.4%
|
|
| 2008 | 16 |
2.2%
|
|
| 2009 | 24 |
3.4%
|
|
| 2010 | 49 |
6.9%
|
|
| 2011 | 13 |
1.8%
|
|
| 2012 | 27 |
3.8%
|
|
| 2013 | 22 |
3.1%
|
|
| 2014 | 29 |
4.1%
|
|
| 2015 | 58 |
8.1%
|
|
| 2016 | 25 |
3.5%
|
|
| 2017 | 48 |
6.7%
|
|
| 2018 | 47 |
6.6%
|
|
| 2019 | 56 |
7.8%
|
|
| 2020 | 61 |
8.5%
|
|
| 2021 | 25 |
3.5%
|
|
| 2022 | 29 |
4.1%
|
|
| 2023 | 18 |
2.5%
|
|
| Sysmiss | 4638 |