Year	% (national estimate)
1962	48.41532953189232
1968	49.61633324198411
1975	55.70605187319884
1979	58.2652329749104
1980	58.740857593575214
1981	59.69048307781314
1982	60.8448652585579
1983	65.24009390339333
1984	67.0260206953284
1985	67.39805093102848
1986	68.54830492438026
1987	69.01483128856944
1988	69.70448131169084
1989	70.2544384030761
1990	70.82884659133995
1991	72.36338376041988
1992	73.17574988784554
1993	74.52384295006786
1994	75.26004487048746
1995	76.05407195924097
1996	76.34030254001665
1997	76.22702292969491
1998	77.13102003238198
1999	77.36359323106122
2000	77.98258437678764
2001	77.9172114679338
2002	77.9564340075311
2003	79.80430714580228
2004	79.66222871850275
2005	81.13228825983984
2006	81.5144118074977
2007	82.29343967319943
2008	82.62900139460967
2009	83.13799132292948
2010	83.41533914681476
2011	83.71303055541946
2012	83.79706466204563
2013	83.99649202585508
2014	84.66596700665771
2015	84.78667849049168
2016	85.12013720542885
2017	84.98244335497549
2018	85.41227268952917
2019	85.90078766549354
2020	86.08154521032407
2021	87.26428487915685
2022	87.2773198617389
2023	87.83424238392975