| Year | Value | | 2021 | 14.131052816514 | | 2020 | -15.142065106188 | | 2019 | 4.9191767938701 | | 2018 | 4.3869971094587 | | 2017 | 9.3640153309659 | | 2016 | 1.7353439639349 | | 2015 | 6.5670063001281 | | 2014 | 1.5170001189445 | | 2013 | 5.2625895836311 | | 2012 | -3.7622281688742 | | 2011 | 3.9416710378283 | | 2010 | 2.9569672417314 | | 2009 | -5.5767891439416 | | 2008 | 7.0717991093747 | | 2007 | 11.447301431144 |
|