Year | Value | 2022 | 34.986318358741 | 2021 | 37.111962653568 | 2020 | 36.736195249935 | 2019 | 35.181552741142 | 2018 | 33.760919001019 | 2017 | 34.386120713334 | 2016 | 33.436978933077 | 2015 | 30.337739301372 | 2014 | 24.059217836567 | 2013 | 20.71131592516 | 2012 | 15.802273651452 | 2011 | 15.624611955046 | 2010 | 17.143992872158 | 2009 | 15.446612744981 | 2008 | 18.847383572014 | 2007 | 23.950910348187 | 2006 | 27.392501063641 | 2005 | 27.047170441253 |
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