| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 33 |
17.6%
|
| 1925 | 1 |
0.5%
|
|
| 1932 | 1 |
0.5%
|
|
| 1946 | 1 |
0.5%
|
|
| 1954 | 1 |
0.5%
|
|
| 1958 | 2 |
1.1%
|
|
| 1960 | 2 |
1.1%
|
|
| 1963 | 2 |
1.1%
|
|
| 1965 | 2 |
1.1%
|
|
| 1968 | 2 |
1.1%
|
|
| 1972 | 1 |
0.5%
|
|
| 1973 | 1 |
0.5%
|
|
| 1974 | 1 |
0.5%
|
|
| 1975 | 1 |
0.5%
|
|
| 1976 | 1 |
0.5%
|
|
| 1978 | 1 |
0.5%
|
|
| 1980 | 5 |
2.7%
|
|
| 1983 | 1 |
0.5%
|
|
| 1984 | 4 |
2.1%
|
|
| 1985 | 3 |
1.6%
|
|
| 1986 | 4 |
2.1%
|
|
| 1989 | 3 |
1.6%
|
|
| 1990 | 10 |
5.3%
|
|
| 1991 | 3 |
1.6%
|
|
| 1992 | 2 |
1.1%
|
|
| 1993 | 2 |
1.1%
|
|
| 1994 | 2 |
1.1%
|
|
| 1995 | 5 |
2.7%
|
|
| 1996 | 2 |
1.1%
|
|
| 1998 | 1 |
0.5%
|
|
| 1999 | 2 |
1.1%
|
|
| 2000 | 6 |
3.2%
|
|
| 2001 | 3 |
1.6%
|
|
| 2002 | 3 |
1.6%
|
|
| 2003 | 3 |
1.6%
|
|
| 2004 | 5 |
2.7%
|
|
| 2005 | 1 |
0.5%
|
|
| 2006 | 3 |
1.6%
|
|
| 2007 | 2 |
1.1%
|
|
| 2008 | 3 |
1.6%
|
|
| 2009 | 1 |
0.5%
|
|
| 2010 | 11 |
5.9%
|
|
| 2011 | 3 |
1.6%
|
|
| 2012 | 3 |
1.6%
|
|
| 2013 | 2 |
1.1%
|
|
| 2014 | 3 |
1.6%
|
|
| 2015 | 5 |
2.7%
|
|
| 2016 | 4 |
2.1%
|
|
| 2017 | 1 |
0.5%
|
|
| 2018 | 5 |
2.7%
|
|
| 2019 | 4 |
2.1%
|
|
| 2020 | 9 |
4.8%
|
|
| 2021 | 3 |
1.6%
|
|
| 2022 | 1 |
0.5%
|
|
| 2023 | 1 |
0.5%
|
|
| Sysmiss | 133 |