Year	% (national estimate)
1966	3.52428242703161
1975	4.091022133797563
1977	5.276346930251984
1983	7.2274881516587675
1984	8.667056416252557
1985	12.287525208873522
1987	10.18324607329843
1996	15.259488768396592
1997	15.574809805579036
2000	14.164004259850904
2009	20.317506554034374
2010	20.563462097008422
2012	23.303834808259587
2013	23.884892086330936
2014	23.520352699601403
2015	24.38951400526694
2016	25.478665002180882