2017 9.42082191780822
2016 9.07267759562841
2015 7.52109589041096
2014 7.2986301369863
2013 9.7841095890411
2012 7.63306010928962
2011 10.9079452054795
2010 10.9257534246575
2009 7.11315068493151
2008 8.49918032786885
2007 7.33260273972603
2006 9.04986301369863
2005 10.692602739726
2004 10.8224043715847
2003 8.79255813953488
2002 6.99161676646707
2001 5.69260273972603