2017 22.6540166204986
2016 22.720218579235
2015 22.5972602739726
2014 22.3884931506849
2013 22.4298630136986
2012 22.5524590163934
2011 22.4980821917808
2010 22.8706849315069
2009 22.4197260273973
2008 22.2035519125683
2007 22.533125
2006 22.5562146892655
2005 22.8298882681564
2004 22.496174863388
2003 22.5623529411765
2002 22.6475570032573
2001 22.5819718309859