Year	% (national estimate)
1978	27.65
1983	43.79
1986	44.38
1987	44.92
1988	47
1989	49.9
1990	48.13
2009	56
2010	55.42
2011	55.6
2012	53.6
2013	54.83
2014	52.71
2015	55.357
2016	56.518
2017	55.193
2018	54.395
2019	54.736