2017 8.96520547945205
2016 9.41393442622951
2015 6.68876712328767
2014 7.31287671232877
2013 9.63123287671233
2012 7.70054644808743
2011 11.4038356164384
2010 10.0219178082192
2009 9.07068493150685
2008 8.53551912568306
2007 8.1041095890411
2006 7.60219178082192
2005 9.86958904109589
2004 11.5273224043716
2003 7.26958904109589
2002 7.4613698630137
2001 7.45917808219178