Year Number 1950 85.988 1951 87.422 1952 88.827 1953 89.938 1954 90.704 1955 91.208 1956 93.15 1957 94.473 1958 95.453 1959 96.286 1960 97.024 1961 98.367 1962 99.538 1963 100.443 1964 100.915 1965 100.898 1966 102.054 1967 102.782 1968 103.179 1969 103.363 1970 103.393 1971 103.731 1972 103.68 1973 103.394 1974 103.044 1975 102.71 1976 102.419 1977 102.204 1978 101.947 1979 101.474 1980 100.729 1981 100.457 1982 99.827 1983 99.021 1984 98.253 1985 97.61 1986 97.244 1987 96.907 1988 96.559 1989 96.119 1990 95.541 1991 94.976 1992 94.366 1993 93.676 1994 92.866 1995 91.919 1996 91.074 1997 90.07 1998 88.946 1999 87.741 2000 86.465 2001 84.924 2002 83.305 2003 81.61 2004 79.831 2005 77.97 2006 75.86 2007 73.754 2008 71.646 2009 69.528 2010 67.411 2011 65.342 2012 63.265 2013 61.251 2014 59.401 2015 57.769 2016 56.249 2017 54.979 2018 53.898 2019 52.911 2020 51.977 2021 51.252 2022 50.511 2023 49.811 2024 49.226 2025 48.778 2026 48.363 2027 48.063 2028 47.842 2029 47.637 2030 47.416 2031 47.171 2032 46.921 2033 46.664 2034 46.414 2035 46.178 2036 45.928 2037 45.693 2038 45.488 2039 45.331 2040 45.234 2041 45.174 2042 45.172 2043 45.234 2044 45.368 2045 45.575 2046 45.816 2047 46.132 2048 46.521 2049 46.977 2050 47.497 2051 48.028 2052 48.618 2053 49.275 2054 50.009 2055 50.824 2056 51.638 2057 52.523 2058 53.477 2059 54.49 2060 55.555 2061 56.561 2062 57.614 2063 58.701 2064 59.801 2065 60.902 2066 61.869 2067 62.825 2068 63.774 2069 64.719 2070 65.658 2071 66.423 2072 67.184 2073 67.936 2074 68.663 2075 69.357 2076 69.845 2077 70.31 2078 70.778 2079 71.282 2080 71.845 2081 72.272 2082 72.77 2083 73.334 2084 73.947 2085 74.594 2086 75.063 2087 75.589 2088 76.166 2089 76.774 2090 77.402 2091 77.838 2092 78.318 2093 78.832 2094 79.366 2095 79.911 2096 80.243 2097 80.606 2098 80.996 2099 81.411 2100 81.848