Year Number 1950 75.781 1951 76.304 1952 76.551 1953 76.604 1954 76.492 1955 76.238 1956 76.809 1957 77.132 1958 77.279 1959 77.331 1960 77.345 1961 78.144 1962 78.816 1963 79.39 1964 79.873 1965 80.276 1966 81.503 1967 82.48 1968 83.286 1969 84.005 1970 84.673 1971 86.014 1972 87.171 1973 88.163 1974 88.988 1975 89.647 1976 90.854 1977 91.782 1978 92.501 1979 93.099 1980 93.627 1981 94.653 1982 95.562 1983 96.334 1984 96.925 1985 97.317 1986 98.27 1987 98.848 1988 99.144 1989 99.26 1990 99.232 1991 99.594 1992 99.71 1993 99.585 1994 99.195 1995 98.54 1996 98.246 1997 97.656 1998 96.833 1999 95.861 2000 94.804 2001 94.221 2002 93.533 2003 92.753 2004 91.883 2005 90.937 2006 90.477 2007 89.828 2008 89.065 2009 88.268 2010 87.469 2011 87.006 2012 86.466 2013 85.845 2014 85.113 2015 84.258 2016 83.633 2017 82.847 2018 81.933 2019 80.93 2020 79.866 2021 79.001 2022 78.054 2023 77.043 2024 75.988 2025 74.905 2026 74.029 2027 73.097 2028 72.134 2029 71.168 2030 70.216 2031 69.444 2032 68.659 2033 67.872 2034 67.092 2035 66.323 2036 65.691 2037 65.056 2038 64.422 2039 63.788 2040 63.157 2041 62.653 2042 62.125 2043 61.594 2044 61.081 2045 60.599 2046 60.205 2047 59.826 2048 59.458 2049 59.092 2050 58.727 2051 58.433 2052 58.126 2053 57.812 2054 57.502 2055 57.202 2056 56.959 2057 56.716 2058 56.473 2059 56.23 2060 55.989 2061 55.795 2062 55.591 2063 55.388 2064 55.2 2065 55.034 2066 54.92 2067 54.813 2068 54.716 2069 54.63 2070 54.556 2071 54.524 2072 54.49 2073 54.459 2074 54.435 2075 54.42 2076 54.434 2077 54.448 2078 54.462 2079 54.477 2080 54.494 2081 54.536 2082 54.569 2083 54.598 2084 54.632 2085 54.674 2086 54.735 2087 54.794 2088 54.854 2089 54.918 2090 54.988 2091 55.068 2092 55.146 2093 55.226 2094 55.312 2095 55.406 2096 55.51 2097 55.616 2098 55.728 2099 55.852 2100 55.993