Year Number 1950 84.084 1951 85.459 1952 86.411 1953 87.194 1954 87.906 1955 88.544 1956 89.624 1957 90.591 1958 91.365 1959 91.861 1960 92.04 1961 93.358 1962 94.365 1963 95.114 1964 95.714 1965 96.229 1966 97.21 1967 98.04 1968 98.728 1969 99.298 1970 99.785 1971 100.645 1972 101.412 1973 102.069 1974 102.613 1975 103.051 1976 104.087 1977 104.871 1978 105.461 1979 105.924 1980 106.274 1981 106.5 1982 106.677 1983 106.751 1984 106.753 1985 106.778 1986 106.409 1987 105.93 1988 105.323 1989 104.456 1990 103.205 1991 103.771 1992 103.833 1993 103.412 1994 102.617 1995 101.507 1996 99.857 1997 97.999 1998 95.872 1999 93.418 2000 90.665 2001 88.845 2002 86.991 2003 85.144 2004 83.399 2005 81.803 2006 79.852 2007 77.94 2008 76.122 2009 74.449 2010 72.955 2011 72.057 2012 71.223 2013 70.488 2014 69.858 2015 69.313 2016 69.222 2017 69.155 2018 69.074 2019 68.908 2020 68.612 2021 68.308 2022 67.881 2023 67.32 2024 66.628 2025 65.816 2026 64.978 2027 64.037 2028 63.01 2029 61.923 2030 60.802 2031 59.753 2032 58.685 2033 57.609 2034 56.535 2035 55.473 2036 54.547 2037 53.64 2038 52.759 2039 51.91 2040 51.093 2041 50.418 2042 49.771 2043 49.163 2044 48.601 2045 48.088 2046 47.704 2047 47.358 2048 47.056 2049 46.806 2050 46.612 2051 46.53 2052 46.496 2053 46.493 2054 46.508 2055 46.532 2056 46.616 2057 46.709 2058 46.801 2059 46.879 2060 46.938 2061 47.007 2062 47.058 2063 47.096 2064 47.127 2065 47.157 2066 47.198 2067 47.232 2068 47.273 2069 47.342 2070 47.448 2071 47.604 2072 47.786 2073 47.994 2074 48.23 2075 48.495 2076 48.811 2077 49.141 2078 49.483 2079 49.83 2080 50.179 2081 50.552 2082 50.918 2083 51.276 2084 51.62 2085 51.946 2086 52.283 2087 52.597 2088 52.892 2089 53.175 2090 53.448 2091 53.731 2092 54.001 2093 54.263 2094 54.525 2095 54.792 2096 55.077 2097 55.358 2098 55.642 2099 55.936 2100 56.243