Year	% (national estimate)
1960	52.01402818570236
1970	47.823733083674
1980	51.284705395689386
1990	53.14119854336827
1991	55.367821494081994
1992	58.05403997940422
1993	57.20474780586754
1995	57.06608320683201
1996	56.4112480730587
1997	57.45893445601685
1998	57.415994518382426
1999	57.57140913430368
2001	56.560036835780686
2002	57.55246848034247
2003	56.64775898740694
2004	56.28235497507953
2005	55.41941816064087
2006	55.80198270106892
2007	54.93469407761482
2008	54.39050882880818
2009	53.98503377591492
2011	52.00240883961726
2012	51.38411973514831
2013	50.66915461712747
2014	50.078344389850045
2015	50.410799304418695
2016	49.41278298111649
2017	49.39424088378692
2018	49.91433883358556
2019	50.29255600541031
2020	45.265740822950185
2021	49.38347608925532
2022	49.62563295961621
2023	48.43627338249076