| Year | Value | | 2021 | 76.309076651032 | | 2020 | 66.440354859209 | | 2019 | 60.731029157539 | | 2018 | 53.198191171801 | | 2017 | 46.664676250878 | | 2016 | 41.52919556628 | | 2015 | 41.381617053524 | | 2014 | 37.655950054172 | | 2013 | 33.910131697746 | | 2012 | 30.795487326753 | | 2011 | 27.548035796306 | | 2010 | 25.680972622051 | | 2009 | 21.508493071526 | | 2008 | 18.556540980317 | | 2007 | 14.353769040738 | | 2006 | 11.589348674299 | | 2005 | 8.6147299461738 | | 2004 | 7.2501273178742 | | 2003 | 3.7703781369071 | | 2002 | 2.7978220491942 | | 2001 | 1.6399570540869 | | 2000 | 1.2170564164936 | | 1999 | 0.64480020241103 | | 1998 | 0.28381160432055 | | 1997 | 0.14194827981427 | | 1996 | 0.040272766761248 | | 1995 | 0.014685668573119 | | 1994 | 0.0028776014345114 | | 1993 | 0.00086463419722957 |
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