Year Number 1950 77.218 1951 77.849 1952 78.316 1953 78.628 1954 78.819 1955 78.93 1956 79.816 1957 80.472 1958 80.991 1959 81.454 1960 81.908 1961 82.952 1962 83.889 1963 84.73 1964 85.458 1965 86.068 1966 87.164 1967 88.029 1968 88.725 1969 89.322 1970 89.86 1971 90.685 1972 91.364 1973 91.905 1974 92.304 1975 92.56 1976 93.445 1977 94.1 1978 94.544 1979 94.79 1980 94.843 1981 95.093 1982 95.03 1983 94.721 1984 94.23 1985 93.591 1986 93.208 1987 92.672 1988 91.981 1989 91.121 1990 90.111 1991 89.392 1992 88.493 1993 87.492 1994 86.494 1995 85.561 1996 84.976 1997 84.43 1998 83.917 1999 83.398 2000 82.855 2001 83.168 2002 83.352 2003 83.468 2004 83.61 2005 83.833 2006 83.917 2007 84.022 2008 84.134 2009 84.195 2010 84.163 2011 84.849 2012 85.4 2013 85.811 2014 86.077 2015 86.19 2016 86.118 2017 85.816 2018 85.339 2019 84.756 2020 84.102 2021 83.283 2022 82.479 2023 81.648 2024 80.74 2025 79.757 2026 78.896 2027 77.951 2028 76.988 2029 76.092 2030 75.304 2031 74.7 2032 74.155 2033 73.666 2034 73.212 2035 72.776 2036 72.445 2037 72.106 2038 71.762 2039 71.412 2040 71.055 2041 70.74 2042 70.397 2043 70.022 2044 69.613 2045 69.169 2046 68.727 2047 68.25 2048 67.741 2049 67.207 2050 66.657 2051 66.131 2052 65.59 2053 65.04 2054 64.489 2055 63.943 2056 63.45 2057 62.953 2058 62.466 2059 62.007 2060 61.585 2061 61.227 2062 60.896 2063 60.59 2064 60.304 2065 60.037 2066 59.821 2067 59.61 2068 59.41 2069 59.231 2070 59.079 2071 58.959 2072 58.854 2073 58.764 2074 58.685 2075 58.616 2076 58.569 2077 58.525 2078 58.482 2079 58.433 2080 58.378 2081 58.314 2082 58.24 2083 58.162 2084 58.089 2085 58.029 2086 57.965 2087 57.906 2088 57.856 2089 57.82 2090 57.8 2091 57.777 2092 57.761 2093 57.757 2094 57.769 2095 57.802 2096 57.821 2097 57.856 2098 57.907 2099 57.973 2100 58.051