Year	% (national estimate)
1986	74.491
1987	73.485
1988	69.961
1989	67.712
1990	68.472
1991	67.392
1992	65.529
1993	64.672
1994	66.029
1995	67.109
1996	66.966
1997	66.71
1998	64.969
1999	62.959
2000	62.674
2001	62.969
2002	63.625
2003	62.405
2004	62.192
2005	62.358
2006	64.42
2007	64.506
2008	63.034
2009	61.373
2010	59.86
2011	59.631
2012	59.274
2013	57.89
2014	60.05
2015	61.398
2016	62.371
2017	63.195
2018	63.724
2019	63.534
2020	62.876
2021	64.85
2022	67.5
2023	68.634