Year	% (national estimate)
2000	50.58
2001	50.31
2002	49.42
2003	49.5
2004	49.45
2005	49.35
2006	49.82
2007	50.9
2008	51.34
2009	50.89
2010	50.77
2011	52.93
2012	52.39
2013	51.9
2014	51.78
2015	52.08
2016	51.9
2017	52.1