Year	% (national estimate)
1974	55.36
1975	54.69
1976	53.54
1978	52.98
1980	50.66
1981	51.71
1982	51.69
1985	52.76
1988	56.89
1990	58.68
1994	57.53
1995	57.83
1996	56.91
1997	56.13
1998	55.24
1999	53.99
2001	53.68
2007	58.9
2008	60.312
2009	57.956
2010	56.162
2011	55.954
2012	55.395
2013	54.989
2014	55.667
2015	54.62
2016	57.718
2017	59.017
2018	59.684
2019	61.14
2020	58.158
2021	59.583
2022	61.977