| Year | Value | | 2022 | 75.135612421431 | | 2021 | 75.134634027305 | | 2020 | 76.136318339648 | | 2019 | 76.904023680145 | | 2018 | 77.827621903932 | | 2017 | 78.501908528081 | | 2016 | 80.070842113042 | | 2015 | 79.727274075852 | | 2014 | 78.558198747989 | | 2013 | 79.023880478343 | | 2012 | 79.62973721499 | | 2011 | 80.722736487539 | | 2010 | 83.876963952807 | | 2009 | 89.103177434373 | | 2008 | 83.482471116792 | | 2007 | 80.795053803151 | | 2006 | 83.313401895815 | | 2005 | 82.957968911516 | | 2004 | 84.173340360903 | | 2003 | 83.824038155925 | | 2002 | 84.874047160826 | | 2001 | 86.382358090357 | | 2000 | 87.358095979659 | | 1999 | 88.588616727167 | | 1998 | 87.023478045031 | | 1997 | 85.455641255422 | | 1996 | 88.184024362102 | | 1995 | 87.837791173073 |
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