Year	% (national estimate)
1980	37.34
1982	37.71
1983	37.13
1984	39.14
1985	38.7
1986	39.31
1987	39.77
1988	40.11
1989	40.62
1990	41.42
1991	41.93
1992	43.04
1993	43.26
1994	46.718
1995	51.494
1996	50.915
1997	51
1998	51.615
1999	52.463
2000	52.665
2001	53.003
2002	54.171
2003	54.439
2004	47.491
2005	48.406
2006	49.187
2007	50.148
2008	51.107
2009	51.393
2010	51.729
2011	52.068
2012	52.441
2013	52.42
2014	52.402
2015	52.48
2016	52.875
2017	53.158
2018	53.409
2019	53.666
2020	53.096
2021	52.496
2022	53.839
2023	53.95