Year | Value | 2020 | 25.404512990196 | 2019 | 22.874204326923 | 2018 | 23.112356732713 | 2017 | 30.936539932167 | 2016 | 25.391777411538 | 2015 | 29.943144789139 | 2014 | 23.389734808526 | 2013 | 26.323024112398 | 2012 | 27.115172038881 | 2011 | 25.20196169888 | 2010 | 24.154881339619 | 2009 | 25.441621837233 | 2008 | 26.608975428385 |
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