Year	% (national estimate)
1980	69.11
1982	70.11
1983	68.37
1984	68.07
1985	67.96
1986	68.34
1987	67.86
1988	67.28
1989	67.35
1990	67.42
1991	67.23
1992	67.2
1993	66.47
1994	68.313
1995	70.844
1996	69.274
1997	68.903
1998	68.832
1999	69.621
2000	69.195
2001	69.031
2002	68.355
2003	68.627
2004	62.201
2005	62.358
2006	62.953
2007	64.107
2008	64.451
2009	63.207
2010	63.331
2011	63.408
2012	63.232
2013	62.971
2014	62.196
2015	61.997
2016	62.191
2017	62.461
2018	63.424
2019	63.594
2020	62.414
2021	62.108
2022	63.242
2023	62.963