| Year | Value | | 2021 | -4.4265097296203 | | 2020 | -3.3251426246526 | | 2019 | -3.0081822519544 | | 2018 | 10.553194008676 | | 2017 | 6.6080364697485 | | 2016 | 1.2813840659871 | | 2015 | 4.0182947168563 | | 2014 | 0.079417544557941 | | 2013 | 5.3255635908149 | | 2012 | 18.176928969644 | | 2011 | -12.115059760049 | | 2010 | 27.573546808975 | | 2009 | -15.066057230173 | | 2008 | 21.203472164532 | | 2007 | 12.850279110744 | | 2006 | 37.185726626816 | | 2005 | -5.7644513377705 | | 2004 | 6.8089428833008 | | 2003 | 2.7234669350104 | | 2002 | 11.802031664594 | | 2001 | 8.793098380918 | | 2000 | -1.743786670706 | | 1999 | 0.67215672280523 |
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