2017 26.0071232876712
2016 26.1254098360656
2015 26.0542699724518
2014 25.8994397759104
2013 25.8361643835616
2012 26.0224043715847
2011 25.8235616438356
2010 26.2082191780822
2009 25.7994520547945
2008 25.5512328767123
2007 25.8678125
2006 25.5341853035144
2005 26.047491638796
2004 25.6811965811966
2003 25.8656069364162
2002 25.8456395348837
2001 25.815