| Year | Value | | 2023 | 59.905658721924 | | 2022 | 51.415092468262 | | 2021 | 51.428569793701 | | 2020 | 49.523811340332 | | 2019 | 58.095237731934 | | 2018 | 55.714286804199 | | 2017 | 60 | | 2016 | 59.047618865967 | | 2015 | 60.476188659668 | | 2014 | 63.942306518555 | | 2013 | 59.715641021729 | | 2012 | 59.715641021729 | | 2011 | 57.819904327393 | | 2010 | 60.287082672119 | | 2009 | 55.980861663818 | | 2008 | 56.310680389404 | | 2007 | 46.601940155029 | | 2006 | 59.512195587158 | | 2005 | 62.745098114014 |
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