Year	% (national estimate)
1977	19.26
1978	20.36
1985	30.3
1987	31.63
1988	44.34
1989	45.5
1990	46.06
1991	45.11
1992	44.99
1995	45.57
1999	42.957
2000	45.528
2001	48.805
2002	50.25
2003	51.386
2004	50.028
2005	49.85
2006	51.425
2007	53.249
2008	53.477
2009	53.597
2010	54.131
2011	53.071
2012	50.648
2013	48.416
2014	49.754
2015	49.189
2016	48.879
2017	50.419
2018	52.357
2019	52.877
2020	52.276
2021	53.258
2022	55.019
2023	57.161