Year | Value | 2022 | 75.465447789312 | 2021 | 75.196429979744 | 2020 | 74.960540068145 | 2019 | 74.738663377746 | 2018 | 74.516935395078 | 2017 | 74.307026675977 | 2016 | 74.104624296667 | 2015 | 73.907772311952 | 2014 | 73.717476280514 | 2013 | 73.539117148355 | 2012 | 73.356621534776 | 2011 | 73.167823263729 | 2010 | 72.972154102064 | 2009 | 72.763309658232 | 2008 | 72.554971807648 | 2007 | 72.336364176022 | 2006 | 72.116640719336 | 2005 | 71.899961003867 | 2004 | 71.681180079433 | 2003 | 71.462846730912 | 2002 | 71.240483102131 | 2001 | 71.012316539968 | 2000 | 70.825790857978 | 1999 | 70.669789463901 | 1998 | 70.533175312823 | 1997 | 70.401547424986 | 1996 | 70.266837186745 | 1995 | 70.126864576367 | 1994 | 69.986070826767 | 1993 | 69.8457179539 | 1992 | 69.71592755336 | 1991 | 69.55903692104 | 1990 | 69.366678979683 | 1989 | 69.197098996622 | 1988 | 69.043049502249 | 1987 | 68.838204581038 | 1986 | 68.629111407303 | 1985 | 68.4786575068 | 1984 | 68.355442743406 | 1983 | 68.222043024752 | 1982 | 68.058831671681 | 1981 | 67.861499524347 | 1980 | 67.588986017063 | 1979 | 67.280113114822 | 1978 | 66.955588047253 | 1977 | 66.619121378189 | 1976 | 66.292114645844 | 1975 | 65.984652808477 | 1974 | 65.647755098473 | 1973 | 65.267746030968 | 1972 | 64.875494163221 | 1971 | 64.464265776062 | 1970 | 64.018082774335 | 1969 | 63.571180953773 | 1968 | 63.117434601082 | 1967 | 62.612137061145 | 1966 | 62.073129017709 | 1965 | 61.502128789524 | 1964 | 60.915840595003 | 1963 | 60.333247293346 | 1962 | 59.749999019432 | 1961 | 59.215484316194 | 1960 | 58.677068363592 |
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