| Year | Value | | 2023 | 36.01895904541 | | 2022 | 31.603773117065 | | 2021 | 25.471698760986 | | 2020 | 25.943395614624 | | 2019 | 27.830188751221 | | 2018 | 19.339622497559 | | 2017 | 19.047618865967 | | 2016 | 14.285714149475 | | 2015 | 14.761904716492 | | 2014 | 16.190475463867 | | 2013 | 9.9526062011719 | | 2012 | 13.270142555237 | | 2011 | 14.218009948731 | | 2010 | 9.4786729812622 | | 2009 | 9.9526062011719 | | 2008 | 12.5 | | 2007 | 14.492753982544 | | 2006 | 14.975845336914 | | 2005 | 21.844659805298 | | 2004 | 22.815534591675 | | 2003 | 39.195980072021 | | 2002 | 65.608467102051 | | 2000 | 65.079368591309 | | 1998 | 68.085105895996 | | 1996 | 61.702129364014 |
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