Year Number 1950 85.26 1951 86.593 1952 88.455 1953 90.15 1954 91.277 1955 91.775 1956 93.265 1957 93.888 1958 94.024 1959 94.067 1960 94.205 1961 94.967 1962 95.652 1963 96.223 1964 96.561 1965 96.625 1966 97.383 1967 97.816 1968 98.003 1969 98.019 1970 97.881 1971 98.529 1972 98.918 1973 99.107 1974 99.173 1975 99.173 1976 99.671 1977 100.02 1978 100.233 1979 100.292 1980 100.198 1981 100.735 1982 100.989 1983 101.044 1984 101.013 1985 100.973 1986 101.737 1987 102.275 1988 102.643 1989 102.874 1990 102.979 1991 104.075 1992 104.955 1993 105.626 1994 106.077 1995 106.307 1996 107.27 1997 107.886 1998 108.227 1999 108.392 2000 108.449 2001 108.632 2002 108.713 2003 108.704 2004 108.573 2005 108.3 2006 108.195 2007 107.87 2008 107.392 2009 106.825 2010 106.188 2011 105.676 2012 105.023 2013 104.248 2014 103.353 2015 102.345 2016 101.331 2017 100.21 2018 98.989 2019 97.675 2020 96.283 2021 95.077 2022 93.76 2023 92.378 2024 90.981 2025 89.598 2026 88.43 2027 87.245 2028 86.051 2029 84.851 2030 83.649 2031 82.645 2032 81.606 2033 80.55 2034 79.501 2035 78.469 2036 77.587 2037 76.696 2038 75.799 2039 74.897 2040 73.992 2041 73.198 2042 72.382 2043 71.555 2044 70.726 2045 69.903 2046 69.167 2047 68.427 2048 67.687 2049 66.949 2050 66.219 2051 65.571 2052 64.916 2053 64.266 2054 63.631 2055 63.019 2056 62.48 2057 61.949 2058 61.429 2059 60.921 2060 60.426 2061 59.984 2062 59.547 2063 59.119 2064 58.705 2065 58.308 2066 57.966 2067 57.625 2068 57.292 2069 56.975 2070 56.678 2071 56.416 2072 56.17 2073 55.936 2074 55.709 2075 55.488 2076 55.304 2077 55.112 2078 54.921 2079 54.748 2080 54.601 2081 54.475 2082 54.368 2083 54.279 2084 54.2 2085 54.131 2086 54.082 2087 54.034 2088 53.992 2089 53.967 2090 53.964 2091 53.976 2092 54 2093 54.035 2094 54.084 2095 54.147 2096 54.213 2097 54.285 2098 54.369 2099 54.466 2100 54.576