| Year | Value | | 2021 | 88.92560523 | | 2020 | 89.92090413 | | 2019 | 82.8536605 | | 2018 | 80.44892248 | | 2017 | 81.62566752 | | 2016 | 80.47585728 | | 2015 | 77.63468203 | | 2014 | 79.98 | | 2013 | 77.8826 | | 2012 | 76.70999012 | | 2011 | 74.43999717 | | 2010 | 75.71 | | 2009 | 70 | | 2008 | 66.05 | | 2007 | 61.8 | | 2006 | 56.08 | | 2005 | 55.19 | | 2004 | 52.89 | | 2003 | 43.04 | | 2002 | 40.14 | | 2001 | 12.52832185 | | 2000 | 9.426803201 | | 1999 | 5.437758139 | | 1998 | 2.689809786 | | 1997 | 1.173381014 | | 1996 | 0.783290109 | | 1995 | 0.523210163 | | 1994 | 0.318509704 | | 1993 | 0.127829232 |
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