2017 3.14986301369863
2016 2.93852459016393
2015 2.02109589041096
2014 1.98876712328767
2013 3.07780821917808
2012 2.63114754098361
2011 4.99342465753425
2010 3.85780821917808
2009 2.59671232876712
2008 2.80218579234973
2007 2.37698630136986
2006 1.90356164383562
2005 4.06301369863014
2004 4.96994535519126
2003 2.65342465753425
2002 2.25123287671233
2001 2.5029702970297