Year	% (national estimate)
1979	74.393
1980	74.37
1981	74.295
1982	72.512
1983	69.26
1984	69.631
1985	69.74
1986	70.043
1987	69.495
1988	70.145
1989	71.138
1990	70.5
1991	67.266
1992	65.754
1993	65.087
1994	66.265
1995	67.358
1996	67.173
1997	66.742
1998	66.932
1999	67.16
2000	67.445
2001	66.854
2002	67.103
2003	67.33
2004	67.74
2005	68.574
2006	68.874
2007	69.589
2008	69.753
2009	68.192
2010	68.695
2011	68.645
2012	68.047
2013	67.321
2014	66.7
2015	66.806
2016	66.615
2017	66.791
2018	67.209
2019	67.42
2020	65.454
2021	66.96
2022	68.464
2023	68.715