Year Number 1950 92.897 1951 93.304 1952 93.162 1953 92.892 1954 92.655 1955 92.431 1956 92.765 1957 93.102 1958 93.309 1959 93.276 1960 92.99 1961 93.618 1962 93.765 1963 93.626 1964 93.439 1965 93.31 1966 93.938 1967 94.452 1968 94.847 1969 95.067 1970 95.103 1971 95.768 1972 96.125 1973 96.252 1974 96.228 1975 96.094 1976 96.612 1977 96.908 1978 97.022 1979 96.98 1980 96.798 1981 97.132 1982 97.197 1983 97.053 1984 96.755 1985 96.334 1986 96.421 1987 96.3 1988 96.002 1989 95.56 1990 95.016 1991 95.061 1992 94.869 1993 94.491 1994 93.939 1995 93.199 1996 93.184 1997 92.915 1998 92.471 1999 91.986 2000 91.566 2001 91.544 2002 91.696 2003 91.975 2004 92.261 2005 92.482 2006 92.842 2007 92.96 2008 92.951 2009 92.97 2010 93.083 2011 93.298 2012 93.568 2013 93.823 2014 93.924 2015 93.801 2016 93.618 2017 93.186 2018 92.575 2019 91.886 2020 91.16 2021 90.352 2022 89.533 2023 88.677 2024 87.745 2025 86.734 2026 85.746 2027 84.706 2028 83.647 2029 82.612 2030 81.628 2031 80.769 2032 79.932 2033 79.127 2034 78.362 2035 77.636 2036 76.996 2037 76.376 2038 75.775 2039 75.183 2040 74.597 2041 74.049 2042 73.494 2043 72.932 2044 72.361 2045 71.781 2046 71.213 2047 70.636 2048 70.05 2049 69.457 2050 68.859 2051 68.281 2052 67.695 2053 67.108 2054 66.531 2055 65.97 2056 65.44 2057 64.923 2058 64.419 2059 63.928 2060 63.45 2061 63.001 2062 62.56 2063 62.136 2064 61.742 2065 61.383 2066 61.064 2067 60.771 2068 60.503 2069 60.258 2070 60.035 2071 59.832 2072 59.642 2073 59.468 2074 59.317 2075 59.191 2076 59.075 2077 58.978 2078 58.896 2079 58.822 2080 58.753 2081 58.673 2082 58.593 2083 58.518 2084 58.453 2085 58.401 2086 58.33 2087 58.269 2088 58.221 2089 58.186 2090 58.168 2091 58.132 2092 58.106 2093 58.096 2094 58.106 2095 58.138 2096 58.144 2097 58.169 2098 58.213 2099 58.274 2100 58.352