Year Years 1950 39.987 1951 40.138 1952 40.44 1953 40.741 1954 41.041 1955 41.341 1956 41.64 1957 41.94 1958 42.24 1959 42.543 1960 42.851 1961 43.164 1962 43.482 1963 43.803 1964 44.121 1965 44.422 1966 44.69 1967 44.917 1968 45.107 1969 45.268 1970 45.423 1971 45.601 1972 45.825 1973 46.111 1974 46.458 1975 46.861 1976 47.303 1977 47.755 1978 48.194 1979 48.606 1980 48.992 1981 49.361 1982 49.72 1983 50.064 1984 50.377 1985 50.609 1986 50.701 1987 50.632 1988 50.415 1989 50.088 1990 49.738 1991 49.477 1992 49.393 1993 49.535 1994 49.907 1995 50.469 1996 51.138 1997 51.807 1998 52.393 1999 52.864 2000 53.213 2001 53.461 2002 53.668 2003 53.886 2004 54.134 2005 54.433 2006 54.795 2007 55.211 2008 55.671 2009 56.167 2010 56.685 2011 57.208 2012 57.72 2013 58.208 2014 58.666 2015 59.092 2016 59.492 2017 59.879 2018 60.262 2019 60.645 2020 61.03 2021 61.416 2022 61.801 2023 62.181 2024 62.557 2025 62.928 2026 63.294 2027 63.656 2028 64.014 2029 64.367 2030 64.716 2031 65.059 2032 65.396 2033 65.727 2034 66.052 2035 66.371 2036 66.685 2037 66.994 2038 67.299 2039 67.6 2040 67.896 2041 68.187 2042 68.472 2043 68.751 2044 69.024 2045 69.291 2046 69.553 2047 69.808 2048 70.059 2049 70.305 2050 70.547 2051 70.785 2052 71.02 2053 71.251 2054 71.478 2055 71.702 2056 71.921 2057 72.134 2058 72.343 2059 72.548 2060 72.748 2061 72.945 2062 73.14 2063 73.333 2064 73.525 2065 73.715 2066 73.903 2067 74.088 2068 74.269 2069 74.448 2070 74.624 2071 74.797 2072 74.969 2073 75.14 2074 75.309 2075 75.477 2076 75.644 2077 75.808 2078 75.97 2079 76.129 2080 76.286 2081 76.442 2082 76.596 2083 76.75 2084 76.903 2085 77.055 2086 77.206 2087 77.356 2088 77.505 2089 77.651 2090 77.796 2091 77.94 2092 78.081 2093 78.221 2094 78.36 2095 78.496 2096 78.631 2097 78.765 2098 78.897 2099 79.028