Year	Percent
2003	25.39761
2004	14.2312
2005	6.46153
2006	4.11035
2007	6.62903
2008	6.41224
2009	9.48833
2010	6.56979
2011	5.84272
2012	10.41526
2013	15.22987
2014	21.60274
2015	29.89435
2016	31.53679
2017	27.58391