| Year | Value | | 2021 | 6.8252806566546 | | 2020 | -9.7445628523165 | | 2019 | -7.640564484852 | | 2018 | 25.395507281275 | | 2017 | 4.5800441882122 | | 2016 | -1.2732354312925 | | 2015 | 11.783517527571 | | 2014 | 0.24287178775089 | | 2013 | 6.82235100701 | | 2012 | 20.19430109903 | | 2011 | 3.5844721075117 | | 2010 | 17.693036318415 |
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