| Year | Value | | 2021 | 17.242415709214 | | 2020 | 0.097799280812879 | | 2019 | 10.629088454172 | | 2018 | 6.9967759159193 | | 2017 | 23.178161524042 | | 2016 | -8.6028693711441 | | 2015 | -7.9045231826715 | | 2014 | -10.376783314234 | | 2013 | 4.4895993232758 | | 2012 | 28.78929387892 | | 2011 | 6.5257494321396 | | 2010 | 0.28352559767215 | | 2009 | 4.9837612086844 | | 2008 | 9.894431820675 | | 2007 | 11.814732489824 | | 2006 | 6.6941065085948 | | 2005 | 6.4750373651484 | | 2004 | 9.5424836480554 | | 2003 | 3.9628179172262 | | 2002 | 22.831758154666 |
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