Year | Value | 2021 | 68.270578491328 | 2020 | 69.777389587903 | 2019 | 69.783524991154 | 2018 | 69.773366126925 | 2017 | 69.867467809163 | 2016 | 69.886274112499 | 2015 | 70.057737455308 | 2014 | 70.312140941713 | 2013 | 70.409466222897 | 2012 | 70.252915436593 | 2011 | 69.743349280889 | 2010 | 69.299954213648 | 2009 | 69.09111835583 | 2008 | 68.526196395721 | 2007 | 68.328008869873 | 2006 | 67.901971022821 | 2005 | 67.574826015757 | 2004 | 67.340024789602 | 2003 | 67.063327427938 | 2002 | 67.244844426411 | 2001 | 67.167971502381 | 2000 | 67.183121862325 | 1999 | 67.05623606297 | 1998 | 67.119293709863 | 1997 | 67.211810935386 | 1996 | 67.214438172219 | 1995 | 67.450113493067 | 1994 | 67.389518623593 | 1993 | 67.574515171581 | 1992 | 67.495059051958 | 1991 | 67.435533696163 | 1990 | 67.472557515875 | 1989 | 67.26191926298 | 1988 | 67.060183121767 | 1987 | 66.745567278826 | 1986 | 66.481343731195 | 1985 | 66.241568309447 | 1984 | 66.078833773215 | 1983 | 65.994473168236 | 1982 | 65.86570467864 | 1981 | 65.696923890485 | 1980 | 65.334956512723 | 1979 | 65.095542027202 | 1978 | 64.870899676081 | 1977 | 64.431258821237 | 1976 | 64.102004527972 | 1975 | 63.971265889239 | 1974 | 63.869142217616 | 1973 | 63.274713689433 | 1972 | 62.981243893503 | 1971 | 62.805839109522 | 1970 | 62.680973277993 | 1969 | 62.46492856094 | 1968 | 62.36816045091 | 1967 | 62.307679221335 | 1966 | 62.127864392496 | 1965 | 61.889021448247 | 1964 | 61.629076842355 | 1963 | 61.124459978026 | 1962 | 60.626380272087 | 1961 | 60.110108424202 | 1960 | 59.794791403562 |
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