Year	Percent
2002	36.28843
2003	26.37133
2004	34.5822
2005	24.29616
2006	26.70801
2007	24.40666
2008	17.84032
2009	19.93064
2010	18.72388
2011	21.25143
2012	19.3416
2013	15.97505
2014	18.62772
2015	17.94917
2016	20.91819