Year	% (national estimate)
1961	35.0314889788574
1971	44.90588949605343
1976	59.03283708161757
1977	47.6640774513115
1978	52.361554552460646
1980	46.084037792143214
1982	53.18434460398333
1986	61.83490511118873
1988	63.602251407129465
1990	61.047164683857716
1991	59.81885499957789
1992	60.925968425757034
1993	60.09050212910504
1994	60.805198846296534
1996	60.73335408336724
1997	59.88652448240289
1998	61.48936170212767
1999	61.22199885123493
2000	61.41315970819571
2001	59.10724418384717
2002	57.06542411563332
2003	57.114520600325015
2004	55.98135496726444
2005	55.54829655439411
2006	55.676665292562866
2007	60.18916075035378
2008	61.050935349423284
2009	61.377610774936564
2010	61.9080010203214
2011	61.452015482377334
2012	61.68715994343377
2013	61.160035708253915
2014	61.219677364742296
2015	61.55049476135041
2016	62.305810397553515
2017	63.711537517789665
2018	64.59648482636989
2019	65.31324192063569
2020	65.1403231536266
2021	65.2978520525946
2022	64.45470282746683