| Year | Value | | 2021 | 8.6909107921454 | | 2020 | -9.7802386556673 | | 2019 | 2.7314209010822 | | 2018 | 0.57410347316966 | | 2017 | 1.3887398519482 | | 2016 | 0.11322874822839 | | 2015 | 1.2748007416406 | | 2014 | 2.7285664820773 | | 2013 | -2.904071386921 | | 2012 | -4.0020234484829 | | 2011 | -12.272140085312 | | 2010 | -5.8614390259908 | | 2009 | -4.0884335661883 | | 2008 | -1.8429009608296 | | 2007 | 2.3745979699029 |
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