Year	% (national estimate)
1986	76.492
1987	75.304
1988	71.669
1989	69.268
1990	68.11
1991	65.595
1992	64.882
1993	65.542
1994	67.201
1995	69.366
1996	69.783
1997	69.236
1998	67.82
1999	68.064
2000	68.965
2001	69.77
2002	70.702
2003	70.478
2004	71.841
2005	72.383
2006	72.877
2007	73.008
2008	72.112
2009	70.073
2010	69.761
2011	69.926
2012	69.05
2013	69.556
2014	70.753
2015	70.741
2016	71.902
2017	73.212
2018	73.048
2019	72.554
2020	72.228
2021	72.814
2022	73.531
2023	73.995