Year	% (national estimate)
2000	53.89
2001	52.74
2002	52.03
2003	51.05
2004	49.78
2005	49.08
2006	49.68
2007	51.12
2008	51.04
2009	50.2
2010	48.57
2011	51.36
2012	50.81
2013	49.98
2014	49.53
2015	48.24