32 1 1 1936 1.0 0.9 40 32 1 2 1937 0.8 0.8 115 32 1 3 1938 0.8 0.8 100 32 1 4 1939 1.4 1.3 80 32 1 5 1940 1.2 1.4 60 32 1 6 1941 1.0 1.2 40 32 1 7 1942 1.5 1.7 23 32 1 8 1943 1.9 1.8 10 32 1 9 1944 1.5 1.6 10 32 1 10 1945 1.5 1.5 25 32 1 11 1946 1.5 1.5 75 32 1 12 1947 1.6 2.0 145 32 1 13 1948 1.8 2.5 130 32 1 14 1949 2.8 2.7 130 32 1 15 1950 2.5 2.9 80 32 1 16 1951 2.5 2.5 65 32 1 17 1952 2.4 3.1 20 32 1 18 1953 2.1 2.4 10 32 1 19 1954 1.9 2.2 5 32 1 20 1955 2.4 2.9 10 32 1 21 1956 2.4 2.5 60 32 1 22 1957 2.6 2.6 190 32 1 23 1958 2.6 3.2 180 32 1 24 1959 4.4 3.8 175 32 1 25 1960 4.2 4.2 120 32 1 26 1961 3.8 3.9 50 32 1 27 1962 3.4 3.7 35 32 1 28 1963 3.6 3.3 20 32 1 29 1964 4.1 3.7 10 32 1 30 1965 3.7 3.9 15 32 1 31 1966 4.2 4.1 30 32 1 32 1967 4.1 3.8 60 32 1 33 1968 4.1 4.7 105 32 1 34 1969 4.0 4.4 105 32 1 35 1970 5.2 4.8 105 32 1 36 1971 5.3 4.8 80 32 1 37 1972 5.3 4.8 65