2017 24.8676712328767
2016 24.9792349726776
2015 25.0624657534247
2014 24.8375342465753
2013 24.7397260273973
2012 25.0513661202186
2011 24.7117808219178
2010 25.2041095890411
2009 24.7183561643836
2008 24.4584699453552
2007 24.8048433048433
2006 24.8232876712329
2005 24.918904109589
2004 24.4934328358209
2003 24.8038356164384
2002 24.7460674157303
2001 24.6094707520891