| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 45 |
3.4%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1880 | 1 |
0.1%
|
|
| 1911 | 1 |
0.1%
|
|
| 1927 | 1 |
0.1%
|
|
| 1928 | 1 |
0.1%
|
|
| 1929 | 1 |
0.1%
|
|
| 1930 | 2 |
0.1%
|
|
| 1932 | 1 |
0.1%
|
|
| 1933 | 1 |
0.1%
|
|
| 1934 | 1 |
0.1%
|
|
| 1935 | 3 |
0.2%
|
|
| 1936 | 2 |
0.1%
|
|
| 1940 | 2 |
0.1%
|
|
| 1943 | 2 |
0.1%
|
|
| 1945 | 2 |
0.1%
|
|
| 1946 | 4 |
0.3%
|
|
| 1947 | 3 |
0.2%
|
|
| 1949 | 1 |
0.1%
|
|
| 1951 | 1 |
0.1%
|
|
| 1952 | 1 |
0.1%
|
|
| 1954 | 1 |
0.1%
|
|
| 1955 | 1 |
0.1%
|
|
| 1956 | 4 |
0.3%
|
|
| 1957 | 2 |
0.1%
|
|
| 1958 | 2 |
0.1%
|
|
| 1959 | 1 |
0.1%
|
|
| 1960 | 1 |
0.1%
|
|
| 1961 | 1 |
0.1%
|
|
| 1962 | 1 |
0.1%
|
|
| 1963 | 2 |
0.1%
|
|
| 1964 | 5 |
0.4%
|
|
| 1965 | 3 |
0.2%
|
|
| 1966 | 1 |
0.1%
|
|
| 1967 | 1 |
0.1%
|
|
| 1969 | 1 |
0.1%
|
|
| 1971 | 1 |
0.1%
|
|
| 1972 | 2 |
0.1%
|
|
| 1973 | 3 |
0.2%
|
|
| 1975 | 1 |
0.1%
|
|
| 1976 | 2 |
0.1%
|
|
| 1978 | 2 |
0.1%
|
|
| 1980 | 1 |
0.1%
|
|
| 1982 | 1 |
0.1%
|
|
| 1983 | 3 |
0.2%
|
|
| 1984 | 1 |
0.1%
|
|
| 1986 | 2 |
0.1%
|
|
| 1988 | 3 |
0.2%
|
|
| 1989 | 7 |
0.5%
|
|
| 1990 | 6 |
0.4%
|
|
| 1991 | 26 |
1.9%
|
|
| 1992 | 50 |
3.7%
|
|
| 1993 | 40 |
3%
|
|
| 1994 | 64 |
4.8%
|
|
| 1995 | 62 |
4.6%
|
|
| 1996 | 77 |
5.8%
|
|
| 1997 | 67 |
5%
|
|
| 1998 | 77 |
5.8%
|
|
| 1999 | 53 |
4%
|
|
| 2000 | 62 |
4.6%
|
|
| 2001 | 65 |
4.9%
|
|
| 2002 | 44 |
3.3%
|
|
| 2003 | 66 |
4.9%
|
|
| 2004 | 50 |
3.7%
|
|
| 2005 | 57 |
4.3%
|
|
| 2006 | 51 |
3.8%
|
|
| 2007 | 50 |
3.7%
|
|
| 2008 | 38 |
2.8%
|
|
| 2009 | 36 |
2.7%
|
|
| 2010 | 41 |
3.1%
|
|
| 2011 | 38 |
2.8%
|
|
| 2012 | 33 |
2.5%
|
|
| 2013 | 34 |
2.5%
|
|
| 2014 | 11 |
0.8%
|
|
| 2015 | 3 |
0.2%
|
|
| 2016 | 2 |
0.1%
|
|
| 2017 | 2 |
0.1%
|