Year Years 1950 38.46 1951 38.163 1952 37.713 1953 37.553 1954 37.681 1955 38.097 1956 38.793 1957 39.753 1958 40.954 1959 42.351 1960 43.893 1961 45.52 1962 47.165 1963 48.77 1964 50.293 1965 51.713 1966 53.035 1967 54.295 1968 55.516 1969 56.698 1970 57.837 1971 58.925 1972 59.955 1973 60.921 1974 61.825 1975 62.669 1976 63.458 1977 64.2 1978 64.9 1979 65.562 1980 66.182 1981 66.755 1982 67.277 1983 67.75 1984 68.179 1985 68.575 1986 68.95 1987 69.314 1988 69.674 1989 70.031 1990 70.377 1991 70.702 1992 70.994 1993 71.246 1994 71.459 1995 71.635 1996 71.78 1997 71.907 1998 72.03 1999 72.159 2000 72.314 2001 72.511 2002 72.753 2003 73.034 2004 73.343 2005 73.655 2006 73.938 2007 74.168 2008 74.33 2009 74.426 2010 74.468 2011 74.483 2012 74.503 2013 74.553 2014 74.643 2015 74.775 2016 74.941 2017 75.123 2018 75.305 2019 75.482 2020 75.651 2021 75.81 2022 75.965 2023 76.116 2024 76.266 2025 76.413 2026 76.558 2027 76.701 2028 76.842 2029 76.981 2030 77.12 2031 77.257 2032 77.394 2033 77.53 2034 77.665 2035 77.799 2036 77.932 2037 78.065 2038 78.196 2039 78.325 2040 78.454 2041 78.581 2042 78.707 2043 78.833 2044 78.957 2045 79.082 2046 79.206 2047 79.329 2048 79.453 2049 79.577 2050 79.701 2051 79.825 2052 79.95 2053 80.074 2054 80.198 2055 80.32 2056 80.44 2057 80.558 2058 80.673 2059 80.785 2060 80.897 2061 81.008 2062 81.12 2063 81.233 2064 81.349 2065 81.465 2066 81.582 2067 81.698 2068 81.812 2069 81.925 2070 82.037 2071 82.147 2072 82.259 2073 82.371 2074 82.483 2075 82.597 2076 82.709 2077 82.821 2078 82.931 2079 83.039 2080 83.147 2081 83.253 2082 83.36 2083 83.467 2084 83.575 2085 83.684 2086 83.794 2087 83.904 2088 84.014 2089 84.123 2090 84.232 2091 84.339 2092 84.447 2093 84.554 2094 84.66 2095 84.766 2096 84.872 2097 84.978 2098 85.083 2099 85.188