Year	% (national estimate)
1978	55.94
1979	56.24
1980	55.87
1983	64.539
1984	64.995
1985	65.571
1986	65.059
1987	65.387
1988	67.253
1989	68.823
1990	68.989
1991	66.837
1992	64.581
1993	63.013
1994	63.38
1995	64.037
1996	64.102
1997	65.151
1998	65.768
1999	65.409
2000	65.903
2001	65.959
2002	65.548
2003	65.904
2004	65.877
2005	65.746
2006	65.668
2007	65.666
2008	65.392
2009	63.12
2010	62.687
2011	62.471
2012	62.584
2013	62.716
2014	63.777
2015	64.439
2016	64.817
2017	64.857
2018	65.262
2019	65.044
2020	63.965
2021	62.814
2022	63.843
2023	63.663