Year	Percent
2005	14.83
2006	16.37
2007	14.28
2008	11.085
2009	13.5467
2010	17.3053
2011	21.6415
2012	22.1085
2013	20.1944
2014	17.2087
2015	16.4209
2016	14.7339
2017	12.7943