Year	% (national estimate)
1980	41.251
1981	41.264
1982	42.311
1983	41.865
1984	39.772
1985	40.927
1986	42.201
1987	44.129
1988	44.229
1989	45.702
1990	46.143
1991	46.188
1992	46.11
1993	46.019
1994	46.9
1995	47.561
1996	48.091
1997	48.597
1998	44.387
1999	45.189
2000	47.784
2001	48.511
2002	49.171
2003	48.011
2004	49.174
2005	49.242
2006	49.659
2007	49.725
2008	49.432
2009	48.491
2010	48.62
2011	48.899
2012	49.163
2013	49.521
2014	50.409
2015	50.617
2016	50.791
2017	51.307
2018	51.305
2019	51.922
2020	51.061
2021	51.692
2022	53.372
2023	54.547