Year	% (national estimate)
1962	20.63
1974	18.85
1980	32.21
1981	32.15
1982	18.45
1988	31.18
1989	31.07
1990	23.92
1996	38.5
1997	37.97
1998	42.27
2000	39.098
2001	48.059
2002	40.14
2003	40.402
2004	42.838
2005	39.748
2006	40.761
2007	39.282
2008	38.88
2009	36.723
2010	33.383
2011	30.093
2012	31.268
2013	30.222
2014	28.119
2015	32.32
2016	35.143
2017	35.267
2018	33.608
2019	33.943
2020	29.911
2021	34.2
2022	35.282
2023	33.656