Year Years 1950 30.163 1951 30.27 1952 30.482 1953 30.687 1954 30.887 1955 31.08 1956 31.268 1957 31.449 1958 31.626 1959 31.798 1960 31.968 1961 32.139 1962 32.316 1963 32.508 1964 32.726 1965 32.986 1966 33.304 1967 33.688 1968 34.139 1969 34.655 1970 35.235 1971 35.876 1972 36.558 1973 37.258 1974 37.951 1975 38.616 1976 39.235 1977 39.792 1978 40.274 1979 40.661 1980 40.934 1981 41.082 1982 41.107 1983 41.019 1984 40.825 1985 40.522 1986 40.106 1987 39.597 1988 39.027 1989 38.435 1990 37.861 1991 37.343 1992 36.915 1993 36.61 1994 36.462 1995 36.511 1996 36.787 1997 37.279 1998 37.958 1999 38.798 2000 39.755 2001 40.78 2002 41.823 2003 42.841 2004 43.807 2005 44.713 2006 45.571 2007 46.41 2008 47.248 2009 48.078 2010 48.884 2011 49.643 2012 50.338 2013 50.958 2014 51.505 2015 51.986 2016 52.417 2017 52.82 2018 53.216 2019 53.615 2020 54.025 2021 54.444 2022 54.866 2023 55.284 2024 55.698 2025 56.106 2026 56.51 2027 56.907 2028 57.297 2029 57.68 2030 58.056 2031 58.426 2032 58.788 2033 59.145 2034 59.495 2035 59.838 2036 60.174 2037 60.502 2038 60.822 2039 61.135 2040 61.441 2041 61.74 2042 62.034 2043 62.323 2044 62.607 2045 62.885 2046 63.157 2047 63.422 2048 63.68 2049 63.93 2050 64.174 2051 64.411 2052 64.643 2053 64.87 2054 65.092 2055 65.309 2056 65.522 2057 65.729 2058 65.932 2059 66.13 2060 66.324 2061 66.515 2062 66.703 2063 66.889 2064 67.074 2065 67.256 2066 67.436 2067 67.613 2068 67.786 2069 67.956 2070 68.122 2071 68.284 2072 68.443 2073 68.6 2074 68.754 2075 68.907 2076 69.058 2077 69.208 2078 69.358 2079 69.507 2080 69.655 2081 69.802 2082 69.947 2083 70.091 2084 70.234 2085 70.375 2086 70.514 2087 70.653 2088 70.791 2089 70.928 2090 71.064 2091 71.199 2092 71.334 2093 71.467 2094 71.599 2095 71.73 2096 71.859 2097 71.988 2098 72.114 2099 72.24