2017 6.36465753424658
2016 7.03579234972678
2015 4.55424657534247
2014 4.7186301369863
2013 7.08246575342466
2012 5.82213114754098
2011 7.81561643835616
2010 6.97397260273973
2009 5.20684931506849
2008 5.49426229508197
2007 4.97342465753425
2006 4.80438356164384
2005 6.87671232876712
2004 6.9292349726776
2003 4.83753424657534
2002 4.71205479452055
2001 4.43260273972603