2017 25.9095890410959
2016 25.9909836065574
2015 25.867397260274
2014 25.6268493150685
2013 25.6856338028169
2012 25.8005464480874
2011 25.7641095890411
2010 26.4265753424658
2009 25.7520547945205
2008 25.494262295082
2007 25.9375342465753
2006 25.9463687150838
2005 26.1415254237288
2004 25.679781420765
2003 25.9002739726027
2002 25.6424657534247
2001 25.7286111111111