Year	Percent
2004	13.12716
2005	13.68411
2006	22.72834
2007	18.45361
2008	14.35708
2009	32.06729
2010	36.65783
2011	21.71011
2012	4.3477
2013	20.85342
2014	17.20581
2015	15.95049