Year | Value | 2021 | 69.718501613156 | 2020 | 70.763236701789 | 2019 | 71.454671513365 | 2018 | 71.250649095436 | 2017 | 70.96648341662 | 2016 | 70.724712324097 | 2015 | 70.43916563693 | 2014 | 70.147991652854 | 2013 | 69.818293046895 | 2012 | 69.490490476229 | 2011 | 69.167278459872 | 2010 | 68.798196740937 | 2009 | 68.497815450982 | 2008 | 68.069451294465 | 2007 | 67.882703109351 | 2006 | 67.602024554377 | 2005 | 67.204173642095 | 2004 | 66.805811839286 | 2003 | 66.572829793812 | 2002 | 66.244300921868 | 2001 | 65.92539847579 | 2000 | 65.536207417258 | 1999 | 65.20285394795 | 1998 | 64.856522630806 | 1997 | 64.541185108985 | 1996 | 64.17511085903 | 1995 | 63.908993508366 | 1994 | 63.66595458707 | 1993 | 63.404335530254 | 1992 | 63.170404077887 | 1991 | 62.884484818058 | 1990 | 62.722074822856 | 1989 | 62.520235690514 | 1988 | 62.122771035402 | 1987 | 61.901724003365 | 1986 | 61.552833172607 | 1985 | 61.082254860436 | 1984 | 60.704971835681 | 1983 | 60.357152867657 | 1982 | 60.037260383442 | 1981 | 59.627221800581 | 1980 | 59.213710566536 | 1979 | 58.763747442665 | 1978 | 58.28226517112 | 1977 | 57.824533448077 | 1976 | 57.262966947933 | 1975 | 56.706778099634 | 1974 | 56.172199072747 | 1973 | 55.700422921236 | 1972 | 55.05658875357 | 1971 | 54.000926899064 | 1970 | 53.887795517738 | 1969 | 53.526971772969 | 1968 | 53.104045975709 | 1967 | 52.434222129815 | 1966 | 51.930854576013 | 1965 | 51.271017882121 | 1964 | 51.493668083218 | 1963 | 50.945052181251 | 1962 | 50.511586728461 | 1961 | 47.27646672972 | 1960 | 44.790792778938 |
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