2017 24.6354609929078
2016 24.5678466076696
2015 24.4794797687861
2014 24.3480446927374
2013 24.4676712328767
2012 24.6620218579235
2011 24.6142465753425
2010 25.1542465753425
2009 24.6396600566572
2008 24.5
2007 24.6702054794521
2006 24.6424332344214
2005 24.906916426513
2004 24.5105555555556
2003 24.7386996904025
2002 24.573883161512
2001 24.6432748538012