2017 10.1671232876712
2016 10.301912568306
2015 6.95753424657534
2014 7.03287671232877
2013 10.0438356164384
2012 6.93852459016393
2011 11.8093150684932
2010 10.5438356164384
2009 8.6958904109589
2008 8.5068306010929
2007 7.51506849315069
2006 8.57397260273973
2005 10.7947945205479
2004 11.9882513661202
2003 7.55342465753425
2002 6.21369863013699
2001 6.72493150684932