| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
1.5%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1860 | 1 |
0.2%
|
|
| 1873 | 1 |
0.2%
|
|
| 1881 | 1 |
0.2%
|
|
| 1921 | 1 |
0.2%
|
|
| 1929 | 1 |
0.2%
|
|
| 1946 | 2 |
0.5%
|
|
| 1947 | 2 |
0.5%
|
|
| 1948 | 2 |
0.5%
|
|
| 1950 | 2 |
0.5%
|
|
| 1952 | 2 |
0.5%
|
|
| 1954 | 4 |
1%
|
|
| 1955 | 2 |
0.5%
|
|
| 1956 | 2 |
0.5%
|
|
| 1957 | 1 |
0.2%
|
|
| 1958 | 2 |
0.5%
|
|
| 1960 | 2 |
0.5%
|
|
| 1961 | 2 |
0.5%
|
|
| 1963 | 1 |
0.2%
|
|
| 1965 | 1 |
0.2%
|
|
| 1967 | 1 |
0.2%
|
|
| 1969 | 2 |
0.5%
|
|
| 1971 | 2 |
0.5%
|
|
| 1974 | 3 |
0.7%
|
|
| 1975 | 3 |
0.7%
|
|
| 1976 | 1 |
0.2%
|
|
| 1977 | 2 |
0.5%
|
|
| 1978 | 2 |
0.5%
|
|
| 1979 | 3 |
0.7%
|
|
| 1980 | 1 |
0.2%
|
|
| 1981 | 1 |
0.2%
|
|
| 1982 | 1 |
0.2%
|
|
| 1983 | 2 |
0.5%
|
|
| 1985 | 4 |
1%
|
|
| 1986 | 3 |
0.7%
|
|
| 1987 | 1 |
0.2%
|
|
| 1988 | 3 |
0.7%
|
|
| 1989 | 25 |
6.1%
|
|
| 1990 | 30 |
7.3%
|
|
| 1991 | 29 |
7.1%
|
|
| 1992 | 26 |
6.4%
|
|
| 1993 | 22 |
5.4%
|
|
| 1994 | 11 |
2.7%
|
|
| 1995 | 9 |
2.2%
|
|
| 1996 | 10 |
2.4%
|
|
| 1997 | 12 |
2.9%
|
|
| 1998 | 8 |
2%
|
|
| 1999 | 6 |
1.5%
|
|
| 2000 | 10 |
2.4%
|
|
| 2001 | 10 |
2.4%
|
|
| 2002 | 6 |
1.5%
|
|
| 2003 | 16 |
3.9%
|
|
| 2004 | 7 |
1.7%
|
|
| 2005 | 8 |
2%
|
|
| 2006 | 7 |
1.7%
|
|
| 2007 | 11 |
2.7%
|
|
| 2008 | 7 |
1.7%
|
|
| 2009 | 8 |
2%
|
|
| 2010 | 11 |
2.7%
|
|
| 2011 | 9 |
2.2%
|
|
| 2012 | 10 |
2.4%
|
|
| 2013 | 6 |
1.5%
|
|
| 2014 | 12 |
2.9%
|
|
| 2015 | 2 |
0.5%
|
|
| 2016 | 6 |
1.5%
|
|
| 2017 | 2 |
0.5%
|