Year	% (national estimate)
1960	56.28
1977	45.39
1979	45.31
1980	48.41
1981	47.97
1982	48.97
1983	48.51
1985	47.513
1986	49.06
1987	58.596
1988	56.142
1989	57.237
1990	59.225
1991	60.118
1992	61.141
1993	59.73
1994	59.609
1995	61.81
1996	60.93
1997	61.781
1998	64.916
1999	68.05
2000	70.883
2001	72.445
2002	72.74
2003	73.077
2004	71.757
2005	66.443
2006	66.264
2007	68.515
2008	69.169
2009	69.577
2010	68.609
2011	69.231
2012	70.753
2013	70.023
2014	67.7
2015	69.417
2016	69.203
2017	69.693
2018	69.787
2019	70.317
2020	69.859
2021	81.361
2022	81.832
2023	82.989