Year	% (national estimate)
1961	58.16
1966	60.71
1971	55.31
1976	57.34
1979	63.847
1980	66.176
1981	65.516
1982	65.375
1983	65.872
1984	66.167
1985	66.755
1986	67.982
1987	67.674
1988	67.322
1989	68.711
1990	68.855
1991	66.687
1992	66.484
1993	65.721
1994	68.142
1995	69.555
1996	69.481
1997	67.519
1998	67.606
1999	67.967
2000	68.454
2001	69.064
2002	68.223
2003	69.008
2004	69.073
2005	69.566
2006	69.486
2007	69.689
2008	69.471
2009	67.729
2010	67.19
2011	67.468
2012	66.778
2013	66.258
2014	66.237
2015	66.706
2016	66.358
2017	66.353
2018	67.542
2019	67.963
2020	66.527
2021	69.021
2022	72.559
2023	71.018