| Year | Value | | 2021 | 1.10174 | | 2020 | 8.99441 | | 2019 | 26.02953 | | 2018 | 31.84376 | | 2017 | 32.76585 | | 2016 | 29.39461 | | 2015 | 25.435 | | 2014 | 23.87158 | | 2013 | 20.07111 | | 2012 | 19.06999 | | 2011 | 25.09099 | | 2010 | 36.71379 | | 2009 | 32.116 | | 2008 | 98.06 | | 2007 | 185.079 | | 2006 | 180.83 | | 2005 | 169.805 | | 2004 | 106.863 | | 2003 | 45.973 | | 2002 | 30.455 | | 2001 | 22.616 | | 2000 | 21.899 |
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