| Year | Value | | 2023 | 48.815166473389 | | 2022 | 43.396224975586 | | 2021 | 46.226413726807 | | 2020 | 46.226413726807 | | 2019 | 50 | | 2018 | 49.528301239014 | | 2017 | 42.8571434021 | | 2016 | 55.714286804199 | | 2015 | 52.8571434021 | | 2014 | 54.761905670166 | | 2013 | 64.454978942871 | | 2012 | 64.928909301758 | | 2011 | 63.98104095459 | | 2010 | 65.402847290039 | | 2009 | 74.407585144043 | | 2008 | 72.115386962891 | | 2007 | 47.342994689941 | | 2006 | 47.82608795166 |
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