Year | Value | 2022 | 77.401394115855 | 2021 | 76.984898394081 | 2020 | 78.041074590393 | 2019 | 76.592722044112 | 2018 | 77.153360588938 | 2017 | 77.628390913974 | 2016 | 77.995675272108 | 2015 | 77.854125121905 | 2014 | 78.435596448914 | 2013 | 78.747386274915 | 2012 | 78.669372521309 | 2011 | 78.727040681238 | 2010 | 79.344947022712 | 2009 | 79.458248253738 | 2008 | 77.028478503097 | 2007 | 76.549429266082 | 2006 | 76.995548523903 | 2005 | 77.461924622219 | 2004 | 77.097673206696 | 2003 | 77.387766716176 | 2002 | 76.69434177106 | 2001 | 76.262709660642 | 2000 | 76.183242762506 | 1999 | 76.244023015006 | 1998 | 76.573197938303 | 1997 | 77.535104662289 | 1996 | 78.595761603365 | 1995 | 77.887058155274 | 1994 | 78.188134764342 | 1993 | 78.776554807336 | 1992 | 77.370482138105 | 1991 | 76.711749053087 | 1990 | 76.374833182414 | 1989 | 76.417004556117 | 1988 | 77.316083288749 | 1987 | 78.835093687608 | 1986 | 78.364121601383 | 1985 | 79.199381276487 | 1984 | 78.641500360664 | 1983 | 78.516922055243 | 1982 | 78.65710789793 | 1981 | 77.95248879869 | 1980 | 75.789671735618 | 1979 | 74.74423043118 | 1978 | 74.639431351401 | 1977 | 74.58434781475 | 1976 | 74.470309450795 | 1975 | 74.131323237633 | 1974 | 71.978048221314 | 1973 | 71.131229282153 | 1972 | 71.57207946986 | 1971 | 71.655301301073 | 1970 | 71.264459259495 | 1969 | 71.989747788477 | 1968 | 72.321693641678 | 1967 | 71.646658104864 | 1966 | 71.429261343056 | 1965 | 71.632514197482 | 1964 | 72.331284008197 | 1963 | 73.296861773834 | 1962 | 72.809545566373 | 1961 | 72.586903003447 | 1960 | 71.988299098945 |
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