| Year | Value | | 2021 | 15.269590645444 | | 2020 | -12.513750425299 | | 2019 | 3.4074964069444 | | 2018 | 5.2378167707235 | | 2017 | 12.937904893762 | | 2016 | 7.6706353452377 | | 2015 | 7.0178011838215 | | 2014 | 3.5041503525611 | | 2013 | 1.3630200679368 | | 2012 | 9.7514136953703 | | 2011 | 3.9671355036263 | | 2010 | 16.105562031894 | | 2009 | -6.6488681238186 | | 2008 | 3.8617110323282 | | 2007 | 5.3721772934915 |
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