Year Years 1950 31.446 1951 31.71 1952 32.237 1953 32.764 1954 33.29 1955 33.815 1956 34.338 1957 34.859 1958 35.375 1959 35.884 1960 36.381 1961 36.863 1962 37.329 1963 37.776 1964 38.208 1965 38.631 1966 39.053 1967 39.481 1968 39.918 1969 40.366 1970 40.827 1971 41.305 1972 41.791 1973 42.268 1974 42.719 1975 43.108 1976 43.397 1977 43.569 1978 43.626 1979 43.58 1980 43.462 1981 43.316 1982 43.19 1983 43.125 1984 43.141 1985 43.243 1986 43.42 1987 43.645 1988 43.899 1989 44.182 1990 44.509 1991 44.902 1992 45.374 1993 45.924 1994 46.541 1995 47.194 1996 47.845 1997 48.463 1998 49.031 1999 49.547 2000 50.031 2001 50.519 2002 51.047 2003 51.641 2004 52.303 2005 53.022 2006 53.772 2007 54.522 2008 55.245 2009 55.932 2010 56.586 2011 57.221 2012 57.854 2013 58.496 2014 59.143 2015 59.782 2016 60.395 2017 60.966 2018 61.484 2019 61.949 2020 62.365 2021 62.742 2022 63.099 2023 63.449 2024 63.801 2025 64.159 2026 64.526 2027 64.896 2028 65.264 2029 65.63 2030 65.991 2031 66.347 2032 66.696 2033 67.036 2034 67.367 2035 67.688 2036 68 2037 68.304 2038 68.601 2039 68.894 2040 69.183 2041 69.467 2042 69.749 2043 70.029 2044 70.309 2045 70.592 2046 70.881 2047 71.177 2048 71.479 2049 71.786 2050 72.096 2051 72.406 2052 72.712 2053 73.01 2054 73.299 2055 73.576 2056 73.842 2057 74.098 2058 74.345 2059 74.584 2060 74.817 2061 75.045 2062 75.268 2063 75.487 2064 75.704 2065 75.918 2066 76.13 2067 76.338 2068 76.544 2069 76.746 2070 76.945 2071 77.142 2072 77.337 2073 77.53 2074 77.721 2075 77.91 2076 78.098 2077 78.283 2078 78.467 2079 78.647 2080 78.823 2081 78.993 2082 79.157 2083 79.315 2084 79.465 2085 79.611 2086 79.751 2087 79.888 2088 80.024 2089 80.158 2090 80.291 2091 80.424 2092 80.556 2093 80.687 2094 80.817 2095 80.945 2096 81.073 2097 81.199 2098 81.323 2099 81.447