Year | Value | 2021 | 73.112196796591 | 2020 | 74.217509381119 | 2019 | 74.785656478958 | 2018 | 74.580899963331 | 2017 | 74.345782900126 | 2016 | 74.062000452989 | 2015 | 73.777682600969 | 2014 | 73.515207049931 | 2013 | 73.227543927717 | 2012 | 72.889437257192 | 2011 | 72.529152951234 | 2010 | 72.156771217485 | 2009 | 71.861452444505 | 2008 | 71.421517085066 | 2007 | 71.276001777328 | 2006 | 70.986224589825 | 2005 | 70.579472981296 | 2004 | 70.143372469502 | 2003 | 69.912722231301 | 2002 | 69.598719408741 | 2001 | 69.275315765107 | 2000 | 68.776858298343 | 1999 | 68.422223653055 | 1998 | 68.179025810869 | 1997 | 67.765632757827 | 1996 | 67.39489398404 | 1995 | 67.155152339847 | 1994 | 66.857357264714 | 1993 | 66.646316807526 | 1992 | 66.3811157788 | 1991 | 66.032404459835 | 1990 | 65.935896012308 | 1989 | 65.705080080187 | 1988 | 65.400643603945 | 1987 | 65.081514542329 | 1986 | 64.738767058527 | 1985 | 64.296284758427 | 1984 | 63.939404794595 | 1983 | 63.563863768818 | 1982 | 63.104575755586 | 1981 | 62.642332032386 | 1980 | 62.143603922618 | 1979 | 61.630395699339 | 1978 | 61.088538206754 | 1977 | 60.542626723328 | 1976 | 59.875664490852 | 1975 | 59.319828806911 | 1974 | 58.753533518825 | 1973 | 58.19511697295 | 1972 | 57.55095518206 | 1971 | 56.648997505482 | 1970 | 56.32961822634 | 1969 | 55.972303259176 | 1968 | 55.547682924929 | 1967 | 54.855037167384 | 1966 | 54.353561673724 | 1965 | 53.737252302421 | 1964 | 53.831676303628 | 1963 | 53.28219924519 | 1962 | 52.841309277756 | 1961 | 49.325708357292 | 1960 | 46.622025094596 |
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