| Year | Value | | 2021 | 77.92035931 | | 2020 | 72 | | 2019 | 64.1 | | 2018 | 57.1 | | 2017 | 50.8 | | 2016 | 40.5 | | 2015 | 30.24704278 | | 2014 | 28.3 | | 2013 | 23 | | 2012 | 19.8 | | 2011 | 17.5 | | 2010 | 16.3 | | 2009 | 16 | | 2008 | 15.7 | | 2007 | 14.03 | | 2006 | 12.306907 | | 2005 | 10.53380134 | | 2004 | 5.090385307 | | 2003 | 3.908766268 | | 2002 | 2.99926518 | | 2001 | 3.002941327 | | 2000 | 1.041401145 | | 1999 | 0.20471135 | | 1998 | 0.072808334 |
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