year sec
1932 165.2
1933 161
1934 165
1935 162.1
1936 162.1
1937 153.3
1938 153.2
1939 156.1
1940 154.2
1941 160.1
1942 153
1943 151.4
1944 159.1
1945 NA
1946 NA
1947 155
1948 153.2
1949 153.4
1950 164.2
1951 151.1
1952 151.4
1953 154.3
1954 154.4
1955 156.3
1956 156.1
1957 151
1958 151.1
1959 158.1
1960 150.7
1961 150.2
1962 151.2
1963 148.7
1964 148.8
1965 157.5
1966 151.1
1967 150.9
1968 151.1
1969 155.1
1970 150
1971 151.6
1972 148.6
1973 147.8
1974 147.4
1975 148
1976 147.6
1977 148.7
1978 147.8
1979 147.3
1980 147.8
1981 148.5
1982 146.5
1983 149.5
1984 149.3
1985 151
1986 148.9
1987 147.8
1988 146.3
1989 148.8
1990 145.3
1991 145.9
1992 147.8
1993 145.5
1994 145.7