Year	% (national estimate)
1988	77.14
1989	76.09
1990	73.486
1991	73.307
1992	72.63
1993	71.172
1994	71.617
1995	71.755
1996	72.011
1997	71.766
1998	71.453
1999	69.96
2000	68.868
2001	66.514
2002	63.926
2003	62.886
2004	62.728
2005	63.183
2006	62.939
2007	62.754
2008	62.606
2009	60.73
2010	62.667
2011	65.108
2012	64.98
2013	65.243
2014	64.821
2015	64.967
2016	65.078
2017	65.636
2018	65.718
2019	63.073
2020	59.78
2021	62.771
2022	65.017
2023	65.712