Year	% (national estimate)
1961	55.95550556180478
1971	52.815952573430344
1980	54.06657018813314
1981	58.39526562069914
1982	54.54165505711897
1983	55.22303783173348
1984	57.281964436917875
1985	56.86941726924712
1986	57.47484766898117
1987	58.86947876722057
1988	60.057512580877074
1989	60.76168493941143
1990	61.985018726591754
1991	62.58806613946801
1992	64.40166642723747
1993	65.37739933612353
1994	68.92613741020446
1995	73.42934244606269
1996	73.39828111549866
1997	74.18501474275952
1998	75.11713865644364
1999	75.43717904827113
2000	75.97231014835815
2001	76.9531630593639
2002	78.76604899715456
2003	78.66887829151979
2004	76.68014722588268
2005	77.9481739657524
2006	78.6325173084755
2007	78.8737846731087
2008	79.68803539770272
2009	80.91958830646969
2010	81.35428066020059
2011	82.1218547428898
2012	82.80137048056983
2013	83.17660137002764
2014	83.84173097291571
2015	83.92730134229204
2016	84.22508947637523
2017	84.32263989040601
2018	83.87492519449431
2019	84.16271958750525
2020	84.75861232411451
2021	84.42919075144508
2022	84.80340701196653
2023	85.27848671370666