| Year | Value | | 2021 | 0.93532553749731 | | 2020 | 6.3223432496146 | | 2019 | 5.7239609797922 | | 2018 | 3.8068968923431 | | 2017 | 3.7434422951088 | | 2016 | 5.45269593375 | | 2015 | 8.1649552749425 | | 2014 | 65.021934793615 | | 2013 | 7.0996609911059 | | 2012 | 32.789405464002 | | 2011 | -16.488353086163 | | 2010 | 6.3258518582873 | | 2009 | 4.5066269422899 |
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