| Year | Value | | 2022 | 34.521317865395 | | 2021 | 32.118779060005 | | 2020 | 33.955575215779 | | 2019 | 25.451011908104 | | 2018 | 27.510778170594 | | 2017 | 29.667496341764 | | 2016 | 32.24744660773 | | 2015 | 23.313583317791 | | 2014 | 21.066007066653 | | 2013 | 19.917952158745 | | 2012 | 20.347139345478 | | 2011 | 19.766673934254 | | 2010 | 21.932561259361 | | 2009 | 27.63222643635 | | 2008 | 18.442516131083 | | 2007 | 23.239565787011 | | 2006 | 29.179291236538 | | 2005 | 32.425103580155 | | 2004 | 51.954295704296 | | 2003 | 52.533762989246 | | 2002 | 59.559250639014 | | 2001 | 60.774643255705 | | 2000 | 73.018868560543 | | 1999 | 77.898453393135 | | 1998 | 82.832782273142 | | 1997 | 48.086935311583 | | 1996 | 40.123182092044 | | 1995 | 37.628661137102 |
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