Year	% (national estimate)
1990	55.36
1991	53.33
1996	52.39
1998	55.01
1999	57.14
2000	58.81
2001	51.3
2002	50
2003	58.5
2004	59.58
2005	60.53
2006	58.88
2007	57.97
2009	47.56
2010	68.09
2012	72.947
2013	71.72
2014	62.034