Year	% (national estimate)
1970	54.104
1980	56.397
1982	62.67
1983	63.15
1984	61.98
1985	62.02
1986	61.21
1987	61.67
1988	61.95
1989	62.39
1990	63.54
1991	55.377
1992	63.48
1993	63.79
1995	62.71
1996	64.64
1997	64
1998	62.3
1999	62.09
2000	63.14
2001	62.63
2002	62.13
2003	62.87
2004	62.07
2005	61.02
2007	61.06
2008	60.87
2009	61.29
2010	58.42
2011	62.49
2012	62.26
2013	64.31
2014	65.7
2015	65.77
2016	65.41
2017	65.67
2018	66.04
2019	66.45
2020	65.33
2021	65.44
2022	66.54