Year | Value | 2021 | 75.438741805825 | 2020 | 76.364337137989 | 2019 | 78.048761671567 | 2018 | 77.837691152853 | 2017 | 77.693438704948 | 2016 | 77.589521915229 | 2015 | 77.518836413686 | 2014 | 77.416982070854 | 2013 | 77.227988277602 | 2012 | 77.029869129869 | 2011 | 76.770105542512 | 2010 | 76.253991305596 | 2009 | 76.391408457667 | 2008 | 76.212933734944 | 2007 | 75.992986628955 | 2006 | 75.857341875561 | 2005 | 75.639254242618 | 2004 | 75.308523399893 | 2003 | 74.982836274984 | 2002 | 74.843327990893 | 2001 | 74.5709906463 | 2000 | 74.221626715648 | 1999 | 73.800833176519 | 1998 | 73.335431074887 | 1997 | 73.109459446726 | 1996 | 72.76268927998 | 1995 | 72.371715255061 | 1994 | 72.004825440563 | 1993 | 71.645545705989 | 1992 | 71.297213233548 | 1991 | 70.926643520157 | 1990 | 70.574614195062 | 1989 | 70.140100548864 | 1988 | 69.69743441096 | 1987 | 69.253308920206 | 1986 | 68.766044861813 | 1985 | 68.112549617795 | 1984 | 67.850592958059 | 1983 | 67.412081073712 | 1982 | 66.870602252347 | 1981 | 66.515068980587 | 1980 | 65.96439061644 | 1979 | 65.522762204032 | 1978 | 65.086151620287 | 1977 | 64.647200975617 | 1976 | 63.987305026444 | 1975 | 63.685207665396 | 1974 | 63.10326121064 | 1973 | 62.677286930358 | 1972 | 62.112693921906 | 1971 | 61.687559589107 | 1970 | 60.755640622623 | 1969 | 60.790421563192 | 1968 | 60.409306256483 | 1967 | 60.012917545634 | 1966 | 59.620951668825 | 1965 | 59.222927186017 | 1964 | 58.780527799055 | 1963 | 58.270985207297 | 1962 | 57.811169109063 | 1961 | 57.339764057233 | 1960 | 56.777635233684 |
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