| Year | Value | | 2022 | 171.20549133664 | | 2021 | 154.75609602339 | | 2020 | 84.864333047204 | | 2019 | 3.0053894939038 | | 2018 | 6.0769890788961 | | 2017 | 4.3213521830319 | | 2016 | 0.78335962436151 | | 2015 | -3.7491452479963 | | 2014 | 1.8546042134091 | | 2013 | 4.821019562974 | | 2012 | 6.5814744768368 | | 2011 | 4.9714857169238 | | 2010 | 3.9834794185583 | | 2009 | 1.1950967116554 |
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