Year	% (national estimate)
1977	50.39
1979	50.41
1980	49.99
1983	60.609
1984	59.267
1985	59.743
1986	59.203
1987	57.995
1988	57.375
1989	58.261
1990	58.261
1991	58.603
1992	58.222
1993	56.882
1994	56.456
1995	56.701
1996	56.392
1997	56.362
1998	56.046
1999	56.653
2000	58.242
2001	57.101
2002	56.59
2003	55.794
2004	56.291
2005	56.718
2006	56.356
2007	57.005
2008	56.911
2009	55.7
2010	55.866
2011	55.472
2012	55.169
2013	54.51
2014	53.884
2015	53.532
2016	53.987
2017	54.956
2018	55.329
2019	55.736
2020	55.127
2021	55.194
2022	56.067
2023	55.911