Year	% (national estimate)
1980	55.94
1981	55.876
1982	56.076
1983	55.33
1984	53.71
1985	54.341
1986	54.925
1987	56.475
1988	56.989
1989	58.018
1990	58.55
1991	59.144
1992	59.362
1993	59.136
1994	60.062
1995	60.657
1996	60.834
1997	60.867
1998	56.399
1999	56.753
2000	59.067
2001	59.59
2002	60.545
2003	59.813
2004	60.547
2005	60.376
2006	60.486
2007	60.563
2008	60.135
2009	59.223
2010	59.322
2011	59.69
2012	59.978
2013	60.195
2014	60.97
2015	60.935
2016	60.888
2017	61.16
2018	60.941
2019	61.189
2020	60.342
2021	60.782
2022	62.371
2023	62.873