Year Number 1950 89.326 1951 90.814 1952 92.917 1953 94.642 1954 95.714 1955 96.318 1956 98.128 1957 98.906 1958 99.277 1959 99.745 1960 100.441 1961 100.8 1962 101.576 1963 102.353 1964 102.539 1965 101.917 1966 101.535 1967 100.449 1968 98.931 1969 97.391 1970 96.026 1971 94.927 1972 93.895 1973 92.906 1974 91.891 1975 90.823 1976 89.967 1977 89.1 1978 88.209 1979 87.276 1980 86.304 1981 85.511 1982 84.608 1983 83.661 1984 82.751 1985 81.914 1986 81.298 1987 80.755 1988 80.221 1989 79.594 1990 78.831 1991 78.257 1992 77.497 1993 76.633 1994 75.774 1995 74.968 1996 74.267 1997 73.64 1998 73.022 1999 72.347 2000 71.603 2001 71.009 2002 70.374 2003 69.712 2004 68.994 2005 68.13 2006 66.951 2007 65.611 2008 64.027 2009 62.308 2010 60.679 2011 59.916 2012 59.187 2013 58.56 2014 58.028 2015 57.55 2016 57.198 2017 56.861 2018 56.544 2019 56.253 2020 55.991 2021 55.798 2022 55.622 2023 55.443 2024 55.239 2025 55.001 2026 54.826 2027 54.612 2028 54.37 2029 54.114 2030 53.856 2031 53.69 2032 53.502 2033 53.292 2034 53.063 2035 52.816 2036 52.625 2037 52.411 2038 52.182 2039 51.946 2040 51.706 2041 51.552 2042 51.385 2043 51.203 2044 51.01 2045 50.807 2046 50.68 2047 50.538 2048 50.389 2049 50.24 2050 50.093 2051 50.041 2052 49.975 2053 49.913 2054 49.882 2055 49.896 2056 50.029 2057 50.191 2058 50.366 2059 50.532 2060 50.674 2061 50.883 2062 51.059 2063 51.204 2064 51.323 2065 51.419 2066 51.563 2067 51.673 2068 51.759 2069 51.833 2070 51.904 2071 52.04 2072 52.162 2073 52.279 2074 52.398 2075 52.527 2076 52.729 2077 52.928 2078 53.126 2079 53.321 2080 53.516 2081 53.779 2082 54.03 2083 54.274 2084 54.51 2085 54.74 2086 55.035 2087 55.315 2088 55.585 2089 55.848 2090 56.109 2091 56.432 2092 56.748 2093 57.057 2094 57.358 2095 57.652 2096 57.987 2097 58.309 2098 58.621 2099 58.927 2100 59.23