Year	% (national estimate)
2000	57.49
2001	56.8
2002	56.3
2003	54.54
2004	52.08
2005	52.33
2006	53.19
2007	55.72
2008	54.79
2009	53.84
2010	53.12
2011	55.16
2012	55.02
2013	54.77
2014	54.35
2015	51.54