| Year | Value | | 2022 | 54.265758636177 | | 2021 | 50.986293347062 | | 2020 | 46.146222486615 | | 2019 | 32.750914369278 | | 2018 | 36.623872174927 | | 2017 | 38.664712822788 | | 2016 | 41.416568671181 | | 2015 | 42.939840996319 | | 2014 | 43.915547863354 | | 2013 | 46.450322818985 | | 2012 | 51.657693032751 | | 2011 | 48.136960450651 | | 2010 | 34.810550697839 | | 2009 | 31.941427740637 | | 2008 | 36.096005406376 | | 2007 | 36.975352621965 | | 2006 | 42.952489476989 | | 2005 | 44.169849082774 | | 2004 | 43.867516611779 | | 2003 | 48.245338472824 | | 2002 | 32.776384255184 |
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