Year	% (national estimate)
1978	42.14
1983	66.82
1986	64.89
1987	65.86
1988	66.06
1989	69.96
1990	67.88
2009	65
2010	63.98
2011	65.6
2012	64
2013	63.64
2014	59.74
2015	60.249
2016	63.894
2017	62.799
2018	62.533
2019	59.592