| Year | Value | | 2021 | 45.60217394 | | 2020 | 45.52922268 | | 2019 | 36.5391824 | | 2018 | 29.7 | | 2017 | 23.20297197 | | 2016 | 20.6 | | 2015 | 18.3 | | 2014 | 16.21487223 | | 2013 | 10 | | 2012 | 7.5 | | 2011 | 5 | | 2010 | 4.3 | | 2009 | 3.84 | | 2008 | 3.4 | | 2007 | 2.93 | | 2006 | 2.028744791 | | 2005 | 1.402654226 | | 2004 | 0.976075415 | | 2003 | 0.587622611 | | 2002 | 0.360871584 | | 2001 | 0.277051322 | | 2000 | 0.252120078 | | 1999 | 0.129067581 | | 1998 | 0.013216341 | | 1997 | 0.006768744 |
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