1936 1937 1937 1939 1940 1940 1941 1941 1942 1943 1944 1946 1946 1946 1947 1947 1947 1948 1948 1948 1948 1949 1949 1949 1949 1949 1950 1950 1950 1950 1950 1951 1951 1951 1951 1951 1951 1951 1952 1952 1952 1952 1952 1953 1953 1953 1954 1954 1954 1954 1955 1955 1955 1955—1971 1956 1956 1956 1959 1959 1960 1963 1966 1967 1967 1968 1973 1975 1977 1977 1981 1989 