Year	% (national estimate)
1960	76.55
1970	75.97
1979	63.86
1980	56.25
1983	59.7
1984	61.79
1985	62.44
1986	59.4
1988	63.8
1989	64.7
1990	60.66
1991	62.93
1993	67.7
1994	65.91
1995	66.75
1996	62.5
1997	64.96
1998	64.59
1999	64.5
2000	60.5
2002	62.3
2003	62.48
2004	63.2
2005	62.07
2006	60.5
2007	61.03
2008	65.21
2009	65.06
2010	62.233
2011	58.254
2012	60.41
2013	58.802
2014	57.394
2015	55.319
2016	55.33
2017	53.912
2018	57.047
2019	56.512
2020	56.762
2021	51.861
2022	57.454
2023	51.474