2017 5.82630136986301
2016 5.37513661202186
2015 3.60794520547945
2014 4.05369863013699
2013 5.45424657534247
2012 4.70273224043716
2011 7.21424657534247
2010 5.83616438356164
2009 4.79698630136986
2008 5.07267759562842
2007 4.91479452054794
2006 4.97205479452055
2005 7.35178082191781
2004 8.72295081967213
2003 4.98164383561644
2002 4.8558904109589
2001 4.17287671232877