| Value | Category | Cases | |
|---|---|---|---|
| 1937 | 1937 | 30 |
1.5%
|
| 1938 | 1938 | 22 |
1.1%
|
| 1939 | 1939 | 31 |
1.6%
|
| 1940 | 1940 | 18 |
0.9%
|
| 1941 | 1941 | 22 |
1.1%
|
| 1942 | 1942 | 31 |
1.6%
|
| 1943 | 1943 | 28 |
1.4%
|
| 1944 | 1944 | 32 |
1.6%
|
| 1945 | 1945 | 22 |
1.1%
|
| 1946 | 1946 | 34 |
1.7%
|
| 1947 | 1947 | 55 |
2.8%
|
| 1948 | 1948 | 27 |
1.4%
|
| 1949 | 1949 | 39 |
2%
|
| 1950 | 1950 | 48 |
2.4%
|
| 1951 | 1951 | 43 |
2.2%
|
| 1952 | 1952 | 43 |
2.2%
|
| 1953 | 1953 | 46 |
2.3%
|
| 1954 | 1954 | 57 |
2.9%
|
| 1955 | 1955 | 50 |
2.5%
|
| 1956 | 1956 | 41 |
2.1%
|
| 1957 | 1957 | 56 |
2.8%
|
| 1958 | 1958 | 52 |
2.6%
|
| 1959 | 1959 | 20 |
1%
|
| 1960 | 1960 | 27 |
1.4%
|
| 1961 | 1961 | 40 |
2%
|
| 1962 | 1962 | 72 |
3.6%
|
| 1963 | 1963 | 46 |
2.3%
|
| 1964 | 1964 | 52 |
2.6%
|
| 1965 | 1965 | 62 |
3.1%
|
| 1966 | 1966 | 61 |
3.1%
|
| 1967 | 1967 | 52 |
2.6%
|
| 1968 | 1968 | 65 |
3.3%
|
| 1969 | 1969 | 60 |
3%
|
| 1970 | 1970 | 58 |
2.9%
|
| 1971 | 1971 | 43 |
2.2%
|
| 1972 | 1972 | 47 |
2.4%
|
| 1973 | 1973 | 36 |
1.8%
|
| 1974 | 1974 | 34 |
1.7%
|
| 1975 | 1975 | 28 |
1.4%
|
| 1976 | 1976 | 26 |
1.3%
|
| 1977 | 1977 | 35 |
1.8%
|
| 1978 | 1978 | 39 |
2%
|
| 1979 | 1979 | 30 |
1.5%
|
| 1980 | 1980 | 19 |
1%
|
| 1981 | 1981 | 23 |
1.2%
|
| 1982 | 1982 | 26 |
1.3%
|
| 1983 | 1983 | 23 |
1.2%
|
| 1984 | 1984 | 23 |
1.2%
|
| 1985 | 1985 | 27 |
1.4%
|
| 1986 | 1986 | 24 |
1.2%
|
| 1987 | 1987 | 30 |
1.5%
|
| 1988 | 1988 | 17 |
0.9%
|
| 1989 | 1989 | 19 |
1%
|
| -5 | Missing; Not asked by the interviewer | 0 | |
| -4 | Not asked | 0 | |
| -3 | Not applicable | 0 | |
| -2 | No answer | 0 | |
| -1 | Don´t know | 0 |