Year	% (national estimate)
1980	52.05
1982	52.76
1983	51.69
1984	52.61
1985	52.33
1986	52.86
1987	52.91
1988	52.84
1989	53.16
1990	53.64
1991	53.9
1992	54.55
1993	54.28
1994	56.975
1995	60.946
1996	59.896
1997	59.764
1998	60.052
1999	60.876
2000	60.788
2001	60.891
2002	61.121
2003	61.431
2004	54.576
2005	55.135
2006	55.834
2007	56.893
2008	57.558
2009	57.107
2010	57.343
2011	57.558
2012	57.67
2013	57.538
2014	57.16
2015	57.115
2016	57.427
2017	57.703
2018	58.298
2019	58.514
2020	57.651
2021	57.202
2022	58.442
2023	58.365