| Year | Value | | 2021 | -1.432642310436 | | 2020 | -1.544998248389 | | 2019 | 12.992293397669 | | 2018 | 4.8601776421908 | | 2017 | -4.2428527027873 | | 2016 | -6.1005551424927 | | 2015 | -8.7018248931281 | | 2014 | 7.8315105165338 | | 2013 | 13.082904137648 | | 2012 | 10.607118667296 | | 2011 | 18.705232610535 | | 2010 | 14.255467417768 | | 2009 | 20.601872270074 | | 2008 | -14.353263246184 | | 2007 | -8.750108063291 | | 2006 | 18.022421687905 | | 2005 | 8.1731852456454 | | 2004 | 9.5840146916454 | | 2003 | 10.619009846543 |
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