Year	Percent
2001	22.50245
2002	22.54575
2003	22.12972
2004	19.97845
2005	20.16686
2006	19.27051
2007	25.09362
2008	25.09813
2009	31.63348
2010	27.08185
2011	23.19026
2012	21.91215
2013	19.28567
2014	22.19793
2015	25.67137
2016	26.02948
2017	24.81162