Year | Value | 2022 | 75.819143676612 | 2021 | 75.932568075826 | 2020 | 75.473898460064 | 2019 | 76.433951891299 | 2018 | 77.098402979567 | 2017 | 75.455389362263 | 2016 | 75.306899408204 | 2015 | 74.848962297212 | 2014 | 75.227230416378 | 2013 | 76.182045822944 | 2012 | 73.951180931594 | 2011 | 73.819371525855 | 2010 | 74.126083967485 | 2009 | 73.525827083636 | 2008 | 72.389488513489 | 2007 | 70.242095568763 | 2006 | 70.107594206867 | 2005 | 74.584502674803 | 2004 | 76.772160828236 | 2003 | 79.393666377733 | 2002 | 78.981892429741 | 2001 | 76.950719683585 | 2000 | 73.392337873239 | 1999 | 76.97078259931 | 1998 | 78.757043950292 | 1997 | 77.602034969078 | 1996 | 70.6454099061 | 1995 | 69.01722434093 | 1994 | 68.277098301687 | 1993 | 65.103076124547 | 1992 | 66.837415963328 | 1991 | 42.645945072684 | 1990 | 41.583273418002 | 1989 | 58.070508730749 | 1988 | 58.396121810315 | 1987 | 58.33612239068 | 1986 | 60.308387663298 | 1985 | 66.509385835917 | 1984 | 61.447192961993 | 1983 | 69.528871549422 | 1982 | 73.666474329429 | 1981 | 69.080780358743 | 1980 | 64.199989244088 |
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