| Year | Value | | 2019 | 0.95881273970281 | | 2018 | 2.2942430703625 | | 2017 | 0.52297668038404 | | 2016 | -1.4698428788647 | | 2015 | 0.64614861418125 | | 2014 | 0.84883820629339 | | 2013 | 10.987234415648 | | 2012 | 11.800309670154 | | 2011 | 13.499840238577 | | 2010 | 6.7659768023648 | | 2009 | 0.66968118596544 | | 2008 | 9.0642362194894 | | 2007 | 10.30090201749 | | 2006 | 3.9361625992987 | | 2005 | 1.111674003872 | | 2004 | 3.2375139400332 | | 2003 | 7.1651589144184 |
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