| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1935 | 1 |
0.2%
|
|
| 1948 | 1 |
0.2%
|
|
| 1960 | 3 |
0.5%
|
|
| 1965 | 1 |
0.2%
|
|
| 1971 | 1 |
0.2%
|
|
| 1972 | 1 |
0.2%
|
|
| 1974 | 1 |
0.2%
|
|
| 1975 | 1 |
0.2%
|
|
| 1977 | 1 |
0.2%
|
|
| 1979 | 2 |
0.3%
|
|
| 1980 | 2 |
0.3%
|
|
| 1982 | 3 |
0.5%
|
|
| 1983 | 1 |
0.2%
|
|
| 1984 | 1 |
0.2%
|
|
| 1985 | 2 |
0.3%
|
|
| 1986 | 1 |
0.2%
|
|
| 1987 | 2 |
0.3%
|
|
| 1988 | 2 |
0.3%
|
|
| 1989 | 3 |
0.5%
|
|
| 1990 | 8 |
1.3%
|
|
| 1991 | 2 |
0.3%
|
|
| 1992 | 1 |
0.2%
|
|
| 1993 | 6 |
1%
|
|
| 1994 | 7 |
1.1%
|
|
| 1995 | 4 |
0.7%
|
|
| 1996 | 3 |
0.5%
|
|
| 1997 | 4 |
0.7%
|
|
| 1998 | 6 |
1%
|
|
| 1999 | 3 |
0.5%
|
|
| 2000 | 18 |
2.9%
|
|
| 2001 | 8 |
1.3%
|
|
| 2002 | 9 |
1.5%
|
|
| 2003 | 8 |
1.3%
|
|
| 2004 | 11 |
1.8%
|
|
| 2005 | 16 |
2.6%
|
|
| 2006 | 19 |
3.1%
|
|
| 2007 | 11 |
1.8%
|
|
| 2008 | 13 |
2.1%
|
|
| 2009 | 20 |
3.3%
|
|
| 2010 | 29 |
4.7%
|
|
| 2011 | 22 |
3.6%
|
|
| 2012 | 29 |
4.7%
|
|
| 2013 | 22 |
3.6%
|
|
| 2014 | 32 |
5.2%
|
|
| 2015 | 61 |
9.9%
|
|
| 2016 | 24 |
3.9%
|
|
| 2017 | 36 |
5.9%
|
|
| 2018 | 40 |
6.5%
|
|
| 2019 | 30 |
4.9%
|
|
| 2020 | 38 |
6.2%
|
|
| 2021 | 21 |
3.4%
|
|
| 2022 | 17 |
2.8%
|
|
| 2023 | 6 |
1%
|