| Year | Value | | 2021 | 66.33566871 | | 2020 | 53.27502287 | | 2019 | 50.73047713 | | 2018 | 39.5 | | 2017 | 30.8 | | 2016 | 24 | | 2015 | 22.35140458 | | 2014 | 18.8 | | 2013 | 11.3 | | 2012 | 10.598 | | 2011 | 9.2 | | 2010 | 8 | | 2009 | 7.5 | | 2008 | 7.269119923 | | 2007 | 6.8 | | 2006 | 5.850585059 | | 2005 | 5.082333808 | | 2004 | 4.746602619 | | 2003 | 3.903295845 | | 2002 | 3.510038711 | | 2001 | 2.830572239 | | 2000 | 2.108336891 | | 1999 | 0.538300048 | | 1998 | 0.274185942 | | 1997 | 0.139505815 | | 1996 | 0.056845636 |
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