YEAR RATE SUNSPOT 1938 0.800000012 LOW 1939 1.299999952 HIGH 1940 1.399999976 HIGH 1941 1.200000048 HIGH 1942 1.700000048 LOW 1943 1.799999952 LOW 1944 1.600000024 LOW 1945 1.5 LOW 1946 1.5 LOW 1947 2 LOW 1948 2.5 HIGH 1949 2.700000048 HIGH 1950 2.900000095 HIGH 1951 2.5 HIGH 1952 3.099999905 HIGH 1953 2.400000095 LOW 1954 2.200000048 LOW 1955 2.900000095 LOW 1956 2.5 LOW 1957 2.599999905 LOW 1958 3.200000048 LOW 1959 3.799999952 HIGH 1960 4.199999809 HIGH 1961 3.900000095 HIGH 1962 3.700000048 HIGH 1963 3.299999952 LOW 1964 3.700000048 LOW 1965 3.900000095 LOW 1966 4.099999905 LOW 1967 3.799999952 LOW 1968 4.699999809 LOW 1969 4.400000095 LOW 1970 4.800000191 HIGH 1971 4.800000191 HIGH 1972 4.800000191 HIGH