Year Years 1950 53.45 1951 53.729 1952 54.287 1953 54.84 1954 55.388 1955 55.933 1956 56.475 1957 57.015 1958 57.556 1959 58.101 1960 58.656 1961 59.224 1962 59.808 1963 60.408 1964 61.018 1965 61.631 1966 62.239 1967 62.83 1968 63.396 1969 63.927 1970 64.417 1971 64.859 1972 65.257 1973 65.616 1974 65.944 1975 66.249 1976 66.546 1977 66.844 1978 67.148 1979 67.459 1980 67.781 1981 68.11 1982 68.435 1983 68.74 1984 69.01 1985 69.226 1986 69.371 1987 69.434 1988 69.41 1989 69.298 1990 69.093 1991 68.791 1992 68.411 1993 67.978 1994 67.518 1995 67.06 1996 66.632 1997 66.256 1998 65.95 1999 65.73 2000 65.614 2001 65.609 2002 65.699 2003 65.862 2004 66.078 2005 66.32 2006 66.555 2007 66.763 2008 66.928 2009 67.046 2010 67.123 2011 67.177 2012 67.235 2013 67.316 2014 67.428 2015 67.57 2016 67.736 2017 67.913 2018 68.088 2019 68.258 2020 68.419 2021 68.571 2022 68.717 2023 68.861 2024 69.003 2025 69.143 2026 69.283 2027 69.423 2028 69.564 2029 69.706 2030 69.849 2031 69.992 2032 70.136 2033 70.28 2034 70.424 2035 70.568 2036 70.713 2037 70.858 2038 71.005 2039 71.152 2040 71.299 2041 71.447 2042 71.594 2043 71.74 2044 71.886 2045 72.033 2046 72.18 2047 72.328 2048 72.478 2049 72.629 2050 72.782 2051 72.936 2052 73.09 2053 73.244 2054 73.398 2055 73.552 2056 73.707 2057 73.862 2058 74.018 2059 74.175 2060 74.335 2061 74.496 2062 74.659 2063 74.824 2064 74.99 2065 75.158 2066 75.325 2067 75.493 2068 75.661 2069 75.828 2070 75.994 2071 76.161 2072 76.328 2073 76.495 2074 76.664 2075 76.833 2076 77.003 2077 77.172 2078 77.341 2079 77.51 2080 77.68 2081 77.852 2082 78.026 2083 78.203 2084 78.382 2085 78.563 2086 78.744 2087 78.926 2088 79.106 2089 79.285 2090 79.463 2091 79.639 2092 79.814 2093 79.988 2094 80.162 2095 80.336 2096 80.51 2097 80.683 2098 80.857 2099 81.03