Year Number 1950 91.029 1951 91.526 1952 91.602 1953 91.507 1954 91.348 1955 91.136 1956 91.607 1957 91.97 1958 92.213 1959 92.33 1960 92.342 1961 93.186 1962 93.757 1963 94.156 1964 94.503 1965 94.853 1966 96.015 1967 97.02 1968 97.884 1969 98.597 1970 99.161 1971 100.158 1972 100.833 1973 101.275 1974 101.578 1975 101.783 1976 102.52 1977 103.081 1978 103.439 1979 103.528 1980 103.321 1981 103.491 1982 103.183 1983 102.563 1984 101.837 1985 101.101 1986 101.263 1987 101.421 1988 101.451 1989 101.163 1990 100.485 1991 100.901 1992 100.725 1993 100.169 1994 99.523 1995 98.932 1996 98.652 1997 98.39 1998 98.104 1999 97.69 2000 97.125 2001 97.476 2002 97.661 2003 97.754 2004 97.846 2005 97.976 2006 98.125 2007 98.223 2008 98.277 2009 98.261 2010 98.148 2011 97.854 2012 97.386 2013 96.791 2014 96.122 2015 95.402 2016 94.62 2017 93.842 2018 93.023 2019 92.099 2020 91.056 2021 90.191 2022 89.175 2023 88.088 2024 87.029 2025 86.042 2026 85.15 2027 84.31 2028 83.504 2029 82.699 2030 81.881 2031 81.175 2032 80.443 2033 79.704 2034 78.985 2035 78.298 2036 77.728 2037 77.161 2038 76.602 2039 76.058 2040 75.53 2041 75.088 2042 74.649 2043 74.206 2044 73.752 2045 73.285 2046 72.862 2047 72.418 2048 71.961 2049 71.504 2050 71.052 2051 70.653 2052 70.245 2053 69.831 2054 69.41 2055 68.983 2056 68.586 2057 68.18 2058 67.77 2059 67.357 2060 66.948 2061 66.576 2062 66.195 2063 65.816 2064 65.449 2065 65.103 2066 64.793 2067 64.496 2068 64.211 2069 63.936 2070 63.673 2071 63.447 2072 63.222 2073 62.997 2074 62.777 2075 62.564 2076 62.363 2077 62.163 2078 61.968 2079 61.78 2080 61.602 2081 61.444 2082 61.285 2083 61.129 2084 60.983 2085 60.849 2086 60.719 2087 60.598 2088 60.485 2089 60.379 2090 60.28 2091 60.185 2092 60.089 2093 59.999 2094 59.921 2095 59.859 2096 59.793 2097 59.737 2098 59.692 2099 59.658 2100 59.634