Year Years 1950 43.9 1951 44.15 1952 44.65 1953 45.15 1954 45.65 1955 46.15 1956 46.65 1957 47.15 1958 47.65 1959 48.15 1960 48.65 1961 49.15 1962 49.65 1963 50.15 1964 50.65 1965 51.15 1966 51.65 1967 52.15 1968 52.65 1969 53.15 1970 53.656 1971 54.174 1972 54.704 1973 55.241 1974 55.773 1975 56.292 1976 56.79 1977 57.252 1978 57.656 1979 57.982 1980 58.18 1981 58.198 1982 58.029 1983 57.697 1984 57.242 1985 56.745 1986 56.3 1987 55.991 1988 55.877 1989 55.984 1990 56.31 1991 56.824 1992 57.447 1993 58.112 1994 58.782 1995 59.43 1996 60.043 1997 60.627 1998 61.192 1999 61.734 2000 62.256 2001 62.765 2002 63.272 2003 63.784 2004 64.301 2005 64.821 2006 65.342 2007 65.855 2008 66.352 2009 66.828 2010 67.276 2011 67.691 2012 68.071 2013 68.419 2014 68.735 2015 69.024 2016 69.289 2017 69.539 2018 69.778 2019 70.01 2020 70.24 2021 70.466 2022 70.687 2023 70.902 2024 71.112 2025 71.318 2026 71.519 2027 71.717 2028 71.911 2029 72.102 2030 72.29 2031 72.477 2032 72.66 2033 72.842 2034 73.022 2035 73.2 2036 73.378 2037 73.555 2038 73.732 2039 73.908 2040 74.084 2041 74.259 2042 74.432 2043 74.604 2044 74.774 2045 74.943 2046 75.111 2047 75.278 2048 75.446 2049 75.613 2050 75.781 2051 75.948 2052 76.115 2053 76.282 2054 76.448 2055 76.614 2056 76.781 2057 76.948 2058 77.116 2059 77.285 2060 77.454 2061 77.624 2062 77.793 2063 77.962 2064 78.13 2065 78.298 2066 78.467 2067 78.637 2068 78.807 2069 78.98 2070 79.153 2071 79.328 2072 79.503 2073 79.679 2074 79.854 2075 80.029 2076 80.202 2077 80.372 2078 80.541 2079 80.708 2080 80.873 2081 81.038 2082 81.202 2083 81.367 2084 81.532 2085 81.698 2086 81.864 2087 82.029 2088 82.193 2089 82.355 2090 82.514 2091 82.671 2092 82.825 2093 82.976 2094 83.124 2095 83.268 2096 83.408 2097 83.546 2098 83.679 2099 83.81