| Value | Category | Cases | |
|---|---|---|---|
| -5 | Missing; Unknown; SG: Refused | 0 | 
                                    
                                    0%
                                 | 
| -4 | Not asked in survey | 0 | 
                                    
                                    0%
                                 | 
| -3 | Not applicable | 0 | 
                                    
                                    0%
                                 | 
| -2 | No answer | 0 | 
                                    
                                    0%
                                 | 
| -1 | Don´t know | 0 | 
                                    
                                    0%
                                 | 
| 1925 | 1 | 
                                    
                                    0.1%
                                 | |
| 1926 | 2 | 
                                    
                                    0.2%
                                 | |
| 1927 | 4 | 
                                    
                                    0.3%
                                 | |
| 1928 | 1 | 
                                    
                                    0.1%
                                 | |
| 1929 | 2 | 
                                    
                                    0.2%
                                 | |
| 1930 | 1 | 
                                    
                                    0.1%
                                 | |
| 1932 | 2 | 
                                    
                                    0.2%
                                 | |
| 1933 | 3 | 
                                    
                                    0.3%
                                 | |
| 1934 | 4 | 
                                    
                                    0.3%
                                 | |
| 1935 | 9 | 
                                    
                                    0.8%
                                 | |
| 1936 | 6 | 
                                    
                                    0.5%
                                 | |
| 1937 | 5 | 
                                    
                                    0.4%
                                 | |
| 1938 | 2 | 
                                    
                                    0.2%
                                 | |
| 1939 | 9 | 
                                    
                                    0.8%
                                 | |
| 1940 | 6 | 
                                    
                                    0.5%
                                 | |
| 1941 | 5 | 
                                    
                                    0.4%
                                 | |
| 1942 | 10 | 
                                    
                                    0.8%
                                 | |
| 1943 | 13 | 
                                    
                                    1.1%
                                 | |
| 1944 | 11 | 
                                    
                                    0.9%
                                 | |
| 1945 | 5 | 
                                    
                                    0.4%
                                 | |
| 1946 | 11 | 
                                    
                                    0.9%
                                 | |
| 1947 | 12 | 
                                    
                                    1%
                                 | |
| 1948 | 10 | 
                                    
                                    0.8%
                                 | |
| 1949 | 14 | 
                                    
                                    1.2%
                                 | |
| 1950 | 23 | 
                                    
                                    1.9%
                                 | |
| 1951 | 16 | 
                                    
                                    1.3%
                                 | |
| 1952 | 18 | 
                                    
                                    1.5%
                                 | |
| 1953 | 19 | 
                                    
                                    1.6%
                                 | |
| 1954 | 14 | 
                                    
                                    1.2%
                                 | |
| 1955 | 14 | 
                                    
                                    1.2%
                                 | |
| 1956 | 19 | 
                                    
                                    1.6%
                                 | |
| 1957 | 20 | 
                                    
                                    1.7%
                                 | |
| 1958 | 20 | 
                                    
                                    1.7%
                                 | |
| 1959 | 15 | 
                                    
                                    1.3%
                                 | |
| 1960 | 28 | 
                                    
                                    2.3%
                                 | |
| 1961 | 29 | 
                                    
                                    2.4%
                                 | |
| 1962 | 21 | 
                                    
                                    1.8%
                                 | |
| 1963 | 22 | 
                                    
                                    1.8%
                                 | |
| 1964 | 22 | 
                                    
                                    1.8%
                                 | |
| 1965 | 34 | 
                                    
                                    2.8%
                                 | |
| 1966 | 27 | 
                                    
                                    2.3%
                                 | |
| 1967 | 22 | 
                                    
                                    1.8%
                                 | |
| 1968 | 21 | 
                                    
                                    1.8%
                                 | |
| 1969 | 27 | 
                                    
                                    2.3%
                                 | |
| 1970 | 33 | 
                                    
                                    2.8%
                                 | |
| 1971 | 15 | 
                                    
                                    1.3%
                                 | |
| 1972 | 22 | 
                                    
                                    1.8%
                                 | |
| 1973 | 29 | 
                                    
                                    2.4%
                                 | |
| 1974 | 24 | 
                                    
                                    2%
                                 | |
| 1975 | 40 | 
                                    
                                    3.3%
                                 | |
| 1976 | 28 | 
                                    
                                    2.3%
                                 | |
| 1977 | 21 | 
                                    
                                    1.8%
                                 | |
| 1978 | 28 | 
                                    
                                    2.3%
                                 | |
| 1979 | 24 | 
                                    
                                    2%
                                 | |
| 1980 | 41 | 
                                    
                                    3.4%
                                 | |
| 1981 | 25 | 
                                    
                                    2.1%
                                 | |
| 1982 | 23 | 
                                    
                                    1.9%
                                 | |
| 1983 | 30 | 
                                    
                                    2.5%
                                 | |
| 1984 | 28 | 
                                    
                                    2.3%
                                 | |
| 1985 | 23 | 
                                    
                                    1.9%
                                 | |
| 1986 | 17 | 
                                    
                                    1.4%
                                 | |
| 1987 | 23 | 
                                    
                                    1.9%
                                 | |
| 1988 | 24 | 
                                    
                                    2%
                                 | |
| 1989 | 24 | 
                                    
                                    2%
                                 | |
| 1990 | 27 | 
                                    
                                    2.3%
                                 | |
| 1991 | 18 | 
                                    
                                    1.5%
                                 | |
| 1992 | 21 | 
                                    
                                    1.8%
                                 | |
| 1993 | 24 | 
                                    
                                    2%
                                 | |
| 1994 | 9 | 
                                    
                                    0.8%
                                 |