Year Number 1950 83.902 1951 85.053 1952 86.569 1953 87.684 1954 88.126 1955 87.972 1956 89.201 1957 89.393 1958 89.055 1959 88.658 1960 88.378 1961 88.693 1962 89.107 1963 89.466 1964 89.465 1965 88.979 1966 89.123 1967 88.737 1968 88.008 1969 87.19 1970 86.409 1971 86.367 1972 86.201 1973 85.966 1974 85.678 1975 85.341 1976 85.6 1977 85.775 1978 85.862 1979 85.829 1980 85.648 1981 85.942 1982 86.017 1983 85.935 1984 85.757 1985 85.496 1986 85.439 1987 85.261 1988 84.98 1989 84.606 1990 84.145 1991 83.664 1992 83.078 1993 82.401 1994 81.642 1995 80.814 1996 80.112 1997 79.312 1998 78.449 1999 77.548 2000 76.617 2001 75.868 2002 75.034 2003 74.163 2004 73.303 2005 72.469 2006 71.69 2007 70.936 2008 70.173 2009 69.353 2010 68.456 2011 67.547 2012 66.55 2013 65.524 2014 64.556 2015 63.695 2016 62.896 2017 62.201 2018 61.577 2019 60.971 2020 60.359 2021 59.843 2022 59.281 2023 58.714 2024 58.19 2025 57.73 2026 57.307 2027 56.933 2028 56.591 2029 56.25 2030 55.898 2031 55.563 2032 55.215 2033 54.866 2034 54.531 2035 54.222 2036 53.952 2037 53.7 2038 53.471 2039 53.273 2040 53.116 2041 53.006 2042 52.927 2043 52.882 2044 52.872 2045 52.893 2046 52.935 2047 53.005 2048 53.1 2049 53.215 2050 53.349 2051 53.481 2052 53.626 2053 53.79 2054 53.98 2055 54.202 2056 54.407 2057 54.637 2058 54.895 2059 55.182 2060 55.501 2061 55.797 2062 56.116 2063 56.456 2064 56.816 2065 57.196 2066 57.518 2067 57.857 2068 58.212 2069 58.578 2070 58.954 2071 59.261 2072 59.578 2073 59.904 2074 60.239 2075 60.581 2076 60.842 2077 61.112 2078 61.401 2079 61.721 2080 62.081 2081 62.375 2082 62.711 2083 63.087 2084 63.496 2085 63.935 2086 64.283 2087 64.664 2088 65.079 2089 65.525 2090 66.002 2091 66.364 2092 66.759 2093 67.188 2094 67.646 2095 68.133 2096 68.49 2097 68.881 2098 69.307 2099 69.765 2100 70.255