Year	%
2001	5.4718608886689655
2002	8.721100451556394
2003	9.824348740937264
2004	12.347935588073645
2005	10.36752518800419
2006	12.630810096620587
2007	18.779176181544653
2008	21.456723919221094
2009	25.44595510811596
2010	22.89557096765368
2011	14.33255415297315