2017 14.5589090909091
2016 5.67
2015 9.15739130434783
2014 9.51436464088398
2013 14.0493150684932
2012 11.4773224043716
2011 15.2759183673469
2010 10.5274725274725
2009 12.4046575342466
2008 14.5704968944099
2007 8.73640350877193
2006 12.2797260273973
2005 12.813698630137
2004 14.079781420765
2003 10.6471232876712
2002 11.5134246575342
2001 11.8049315068493