Year | Value | 2021 | 71.200086029135 | 2020 | 71.373408106362 | 2019 | 71.325317090261 | 2018 | 71.261623429029 | 2017 | 71.17832724888 | 2016 | 70.894243001303 | 2015 | 70.702350979153 | 2014 | 70.75476329971 | 2013 | 70.753670656522 | 2012 | 70.702208435072 | 2011 | 70.708479052131 | 2010 | 70.560612923348 | 2009 | 70.178880974418 | 2008 | 70.33150244257 | 2007 | 70.150665077184 | 2006 | 70.221924176932 | 2005 | 70.141197410936 | 2004 | 70.035555159343 | 2003 | 69.921872006309 | 2002 | 69.649216732211 | 2001 | 69.929574495164 | 2000 | 69.893017743398 | 1999 | 69.929596465557 | 1998 | 69.891167647378 | 1997 | 69.683048691827 | 1996 | 69.599097093001 | 1995 | 69.515358058599 | 1994 | 69.290318498334 | 1993 | 69.094007068227 | 1992 | 68.972195513292 | 1991 | 68.80596548461 | 1990 | 68.723818735725 | 1989 | 68.463851815459 | 1988 | 68.356033662818 | 1987 | 68.014798987415 | 1986 | 67.72401599723 | 1985 | 67.568959931687 | 1984 | 67.144610570198 | 1983 | 66.662178406046 | 1982 | 66.19138032418 | 1981 | 65.964539367808 | 1980 | 65.814154486617 | 1979 | 65.755694451759 | 1978 | 65.338601186592 | 1977 | 64.842188997153 | 1976 | 64.570194437149 | 1975 | 63.821421978427 | 1974 | 63.771543945577 | 1973 | 63.212047734103 | 1972 | 63.191031279783 | 1971 | 62.835014423625 | 1970 | 62.406563160152 | 1969 | 61.92516347425 | 1968 | 61.528964083064 | 1967 | 60.949115770687 | 1966 | 60.356923099348 | 1965 | 59.758567996771 | 1964 | 58.569925325697 | 1963 | 58.291813763835 | 1962 | 57.556575102611 | 1961 | 56.723147441912 | 1960 | 55.926688630155 |
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