| Year | Value | | 2021 | 33.96533089 | | 2020 | 28.22915416 | | 2019 | 22.41593843 | | 2018 | 19 | | 2017 | 18.7 | | 2016 | 14.5 | | 2015 | 11.25498791 | | 2014 | 6 | | 2013 | 4.9 | | 2012 | 4.5 | | 2011 | 4.148323066 | | 2010 | 3.13 | | 2009 | 2.24 | | 2008 | 1.85 | | 2007 | 1.79 | | 2006 | 1.537854346 | | 2005 | 1.271031439 | | 2004 | 1.182540965 | | 2003 | 0.951327115 | | 2002 | 0.702945595 | | 2001 | 0.36341789 | | 2000 | 0.225247851 | | 1999 | 0.154906741 | | 1998 | 0.047877304 | | 1997 | 0.024648796 | | 1996 | 0.0016931 |
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