Year	% (national estimate)
1978	34.55
1983	54.41
1986	53.86
1987	54.6
1988	55.82
1989	59.17
1990	57.27
2009	60.25
2010	59.48
2011	60
2012	58.5
2013	58.92
2014	56.06
2015	57.693
2016	60.039
2017	58.825
2018	58.28
2019	57.055