Year | Value | 2021 | 73.94768013742 | 2020 | 74.85688859991 | 2019 | 75.469360431077 | 2018 | 75.271093327743 | 2017 | 75.062380878564 | 2016 | 74.837321824993 | 2015 | 74.572638440171 | 2014 | 74.386303478595 | 2013 | 74.119859304156 | 2012 | 73.821488767593 | 2011 | 73.533870566597 | 2010 | 73.191030904157 | 2009 | 72.929764541359 | 2008 | 72.517531697758 | 2007 | 72.368984314438 | 2006 | 72.085482088028 | 2005 | 71.69245139368 | 2004 | 71.329344904105 | 2003 | 71.073359060335 | 2002 | 70.780126682662 | 2001 | 70.507027660641 | 2000 | 70.085134744906 | 1999 | 69.762999644171 | 1998 | 69.526409474971 | 1997 | 69.224045884954 | 1996 | 68.895965076889 | 1995 | 68.686896180799 | 1994 | 68.503006863382 | 1993 | 68.292376402955 | 1992 | 68.073331910554 | 1991 | 67.799525948142 | 1990 | 67.728575711035 | 1989 | 67.541503880142 | 1988 | 67.224493509058 | 1987 | 67.025527373832 | 1986 | 66.707646644908 | 1985 | 66.324305578549 | 1984 | 66.062984826709 | 1983 | 65.760428574662 | 1982 | 65.513769193133 | 1981 | 65.131610278991 | 1980 | 64.705493144004 | 1979 | 64.347082714857 | 1978 | 63.887479370994 | 1977 | 63.473806959013 | 1976 | 62.910531751861 | 1975 | 62.447679423036 | 1974 | 61.983399878879 | 1973 | 61.531653004042 | 1972 | 61.033276300463 | 1971 | 60.382363653924 | 1970 | 60.087340280257 | 1969 | 59.795826851317 | 1968 | 59.498457086649 | 1967 | 59.045492255561 | 1966 | 58.622218524312 | 1965 | 58.152949192947 | 1964 | 58.219674326514 | 1963 | 57.710607858046 | 1962 | 57.362896253129 | 1961 | 54.946198079554 | 1960 | 52.949511850027 |
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