| Year | Value | | 2021 | 77.76723663 | | 2020 | 74.72185387 | | 2019 | 69.61219021 | | 2018 | 61.4 | | 2017 | 54.2 | | 2016 | 53.3 | | 2015 | 52.5 | | 2014 | 51.6 | | 2013 | 35 | | 2012 | 32 | | 2011 | 30 | | 2010 | 27 | | 2009 | 24.05 | | 2008 | 23.18 | | 2007 | 22.29 | | 2006 | 21.39599117 | | 2005 | 20.48780488 | | 2004 | 19.57062058 | | 2003 | 18.64518218 | | 2002 | 14.75884055 | | 2001 | 5.128103982 | | 2000 | 4.063907991 | | 1999 | 2.473166147 | | 1998 | 1.484854484 | | 1997 | 0.990883868 | | 1996 | 0.298032982 |
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