Year | Value | 2022 | 77.622252121358 | 2021 | 75.103006511555 | 2020 | 80.034004208021 | 2019 | 78.031690954141 | 2018 | 76.935925684948 | 2017 | 77.361992706279 | 2016 | 78.166900325475 | 2015 | 78.283003759 | 2014 | 76.973059832538 | 2013 | 74.596361736417 | 2012 | 73.114610208785 | 2011 | 70.781885174686 | 2010 | 72.259971592 | 2009 | 75.249146157503 | 2008 | 72.800161034705 | 2007 | 70.611492901002 | 2006 | 71.06118075867 | 2005 | 76.375977571197 | 2004 | 79.255928225152 | 2003 | 82.084987055697 | 2002 | 82.731419734186 | 2001 | 83.702137218055 | 2000 | 82.373299960129 | 1999 | 81.750746207148 | 1998 | 82.342268091964 | 1997 | 80.725606016591 | 1996 | 82.434405557276 | 1995 | 80.988333901532 | 1994 | 81.132898487508 | 1993 | 84.79383179306 | 1992 | 85.165549502551 | 1991 | 84.856388354933 | 1990 | 81.910888466591 | 1989 | 76.703720560904 | 1988 | 76.790671102105 | 1987 | 79.137750887155 | 1986 | 78.94788824835 | 1985 | 70.881156635702 | 1984 | 72.273729928283 | 1983 | 73.276712303279 | 1982 | 69.722423411775 | 1981 | 71.097065212048 | 1980 | 66.807649513282 | 1979 | 67.818291853769 | 1978 | 77.830501675783 | 1977 | 85.29300201384 | 1976 | 83.962345620794 | 1975 | 84.137358318908 | 1974 | 79.429942879571 | 1973 | 79.580227851676 | 1972 | 83.176265897474 | 1971 | 80.858622315213 | 1970 | 80.416642792259 | 1969 | 72.196296234769 | 1968 | 72.707145227584 | 1967 | 67.834252968198 | 1966 | 65.916083032642 | 1965 | 67.233869866417 | 1964 | 64.307805900971 | 1963 | 65.647423871229 | 1962 | 62.472249765368 | 1961 | 61.504276623224 | 1960 | 60.01292694708 |
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