2017 9.58575342465753
2016 9.15245901639344
2015 7.20520547945205
2014 6.96739726027397
2013 9.38465753424657
2012 7.70846994535519
2011 11.0035616438356
2010 10.607397260274
2009 7.10219178082192
2008 8.5
2007 7.17890410958904
2006 7.93123287671233
2005 10.5884931506849
2004 10.8005464480874
2003 6.45972602739726
2002 7.19506849315068
2001 6.42958904109589