Year	% (national estimate)
1979	56.951
1980	57.553
1981	57.6
1982	56.428
1983	54.417
1984	55.109
1985	55.784
1986	56.887
1987	56.936
1988	57.872
1989	59.26
1990	59.332
1991	57.096
1992	56.129
1993	55.669
1994	56.827
1995	58.168
1996	58.123
1997	57.854
1998	58.17
1999	58.458
2000	59.18
2001	59.044
2002	59.345
2003	59.829
2004	60.048
2005	61.168
2006	61.679
2007	62.342
2008	62.719
2009	61.806
2010	61.998
2011	62.114
2012	61.766
2013	61.283
2014	60.783
2015	61.074
2016	61.175
2017	61.537
2018	62.166
2019	62.549
2020	60.834
2021	62.478
2022	64.192
2023	64.483