Year	% (national estimate)
1960	20.915979496322713
1970	23.0975228743584
1994	44.23003681604673
1996	44.49152542372881
1997	48.431618569636136
1998	50.381679389312986
1999	49.68632371392723
2005	56.85071574642128
2012	65.73983341499266
2013	59.01782770775746
2014	59.537093922790476
2015	60.47212899644201
2016	61.89440056346531
2017	61.41110160535453
2019	69.38111934775488
2021	64.22685730157261