| Year | Value | | 2021 | 13.384754594192 | | 2020 | -14.919878008412 | | 2019 | 3.6387860379754 | | 2018 | 5.1711025489068 | | 2017 | 8.4590997347853 | | 2016 | 3.9211436508739 | | 2015 | 7.3063754886419 | | 2014 | 0.67646160592587 | | 2013 | 6.7112475511471 | | 2012 | -4.4501844191956 | | 2011 | 4.5546921390811 | | 2010 | 1.5266554925761 | | 2009 | -4.2101800926181 | | 2008 | 6.9072833047866 | | 2007 | 12.928866572258 |
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