Year Number 1950 73.591 1951 74.488 1952 75.547 1953 76.145 1954 76.168 1955 75.789 1956 77.219 1957 77.762 1958 77.869 1959 77.932 1960 78.084 1961 78.971 1962 79.937 1963 80.783 1964 81.167 1965 80.957 1966 81.553 1967 81.495 1968 80.965 1969 80.22 1970 79.372 1971 79.651 1972 79.792 1973 79.798 1974 79.649 1975 79.349 1976 80.144 1977 80.679 1978 81.048 1979 81.383 1980 81.805 1981 82.96 1982 83.884 1983 84.68 1984 85.389 1985 86.014 1986 87.155 1987 87.956 1988 88.518 1989 89.013 1990 89.617 1991 90.426 1992 91.013 1993 91.434 1994 91.572 1995 91.241 1996 91.771 1997 92.014 1998 91.93 1999 91.574 2000 91.028 2001 91.111 2002 90.944 2003 90.583 2004 90.084 2005 89.504 2006 89.27 2007 88.812 2008 88.203 2009 87.501 2010 86.741 2011 86.314 2012 85.779 2013 85.172 2014 84.513 2015 83.808 2016 83.433 2017 82.907 2018 82.267 2019 81.558 2020 80.802 2021 80.182 2022 79.509 2023 78.77 2024 77.937 2025 77.011 2026 76.251 2027 75.377 2028 74.428 2029 73.451 2030 72.476 2031 71.675 2032 70.844 2033 69.997 2034 69.141 2035 68.283 2036 67.577 2037 66.846 2038 66.105 2039 65.363 2040 64.632 2041 64.035 2042 63.426 2043 62.811 2044 62.2 2045 61.597 2046 61.105 2047 60.605 2048 60.102 2049 59.601 2050 59.106 2051 58.709 2052 58.302 2053 57.891 2054 57.487 2055 57.095 2056 56.778 2057 56.461 2058 56.148 2059 55.842 2060 55.546 2061 55.32 2062 55.095 2063 54.873 2064 54.66 2065 54.46 2066 54.319 2067 54.174 2068 54.034 2069 53.904 2070 53.791 2071 53.718 2072 53.65 2073 53.591 2074 53.547 2075 53.52 2076 53.535 2077 53.556 2078 53.584 2079 53.619 2080 53.663 2081 53.732 2082 53.799 2083 53.868 2084 53.947 2085 54.039 2086 54.142 2087 54.251 2088 54.368 2089 54.494 2090 54.63 2091 54.774 2092 54.919 2093 55.072 2094 55.237 2095 55.42 2096 55.603 2097 55.798 2098 56.008 2099 56.234 2100 56.474