Year	Percent
2004	27.03547
2005	27.35101
2006	28.6461
2007	17.86961
2009	15.55719
2010	14.9184
2011	13.12466
2012	14.26914
2013	14.82348
2014	14.89523
2015	15.95206
2016	17.16756