| Year | Value | | 2023 | 67.452827453613 | | 2022 | 67.924530029297 | | 2021 | 65.238098144531 | | 2020 | 66.190475463867 | | 2019 | 61.904762268066 | | 2018 | 61.428569793701 | | 2017 | 62.8571434021 | | 2016 | 61.428569793701 | | 2015 | 58.571430206299 | | 2014 | 30.288461685181 | | 2013 | 34.123222351074 | | 2012 | 34.597156524658 | | 2011 | 33.175354003906 | | 2010 | 22.966506958008 | | 2009 | 36.842105865479 | | 2008 | 32.524272918701 |
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