| Year | Value | | 2021 | 10.006870143428 | | 2020 | -16.183713657328 | | 2019 | 6.4882446286765 | | 2018 | 8.1370455710529 | | 2017 | 2.0178537054038 | | 2016 | 5.2206112828707 | | 2015 | 3.0702852994688 | | 2014 | 0.39316779854931 | | 2013 | 2.6009578686477 | | 2012 | 1.2111951232314 | | 2011 | 3.630312234615 | | 2010 | -2.3137680561248 | | 2009 | 2.2615801181917 | | 2008 | 3.9738527337254 |
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