Year | Value | 2021 | 1.543908236711 | 2020 | 2.01662499107 | 2019 | 4.0930755578228 | 2018 | 4.2938269499163 | 2017 | 4.8729311487122 | 2016 | 7.1152938807171 | 2015 | 6.0851852513641 | 2014 | 9.7437271883954 | 2013 | 7.1172069645495 | 2012 | 1.4223352009801 | 2011 | 2.6265047405265 | 2010 | 5.5339743213408 | 2009 | 4.8366370910402 |
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