Year	% (national estimate)
1976	73.25
1977	63.98
1978	66.64
1982	63.68
1986	67.32
1988	67.56
1989	66.66
1990	64.679
1991	64.22
1992	64.503
1993	63.8
1994	63.881
1995	62.19
1996	63.62
1997	63.23
1998	63.276
1999	62.948
2000	63.638
2001	63.046
2002	61.62
2003	61.299
2004	60.879
2005	59.283
2006	59.36
2007	60.889
2008	61.589
2009	62.014
2010	62.845
2011	63.465
2012	64.404
2013	63.863
2014	63.927
2015	63.573
2016	63.462
2017	64.171
2018	64.684
2019	65.788
2020	64.534
2021	63.348
2022	64.699