Year	% (national estimate)
1960	50.61
1975	60.03
1976	59.99
1977	59.98
1979	69.44
1981	69.23
1982	69.07
1983	68.88
1991	58.811
1992	60.215
1993	59.731
1994	59.058
1995	68.492
1996	63.468
1997	67.448
1998	74.229
1999	74.85
2000	80.458
2001	79.496
2002	70.366
2003	76.266
2004	75.651
2005	78.065
2006	80.31
2007	79.511
2008	79.447
2009	75.481
2010	76.089
2011	74.57
2012	78.039
2013	81.46
2014	78.752
2015	81.988
2016	83.468
2017	82.391
2018	80.978
2019	80.614
2020	75.434
2021	76.439
2022	79.129
2023	81.723