Year	% (national estimate)
1976	67.81
1980	69.44
1981	68.85
1982	68.49
1985	65.71
1986	66.94
1987	67.21
1990	51.729
1992	49.828
1995	51.32
1996	45.75
1997	59.81
1999	62.253
2000	60.12
2005	55.278
2006	61.896
2008	57.734
2009	56.465
2011	60.399
2012	53.923
2013	53.023
2014	60.067
2015	53.669
2016	50.143
2017	50.953
2018	55.143
2019	60.091
2020	57.303
2021	66.236
2022	65.92