Year	% (national estimate)
1983	55.936
1984	67.236
1985	70.857
1986	73.044
1987	70.231
1988	72.165
1989	70.841
1990	67.758
1991	67.293
1992	64.11
1993	60.74
1994	64.772
1995	70.997
1996	69.736
1997	72.524
1998	66.735
1999	69.478
2000	70.281
2001	64.275
2002	64.351
2003	60.861
2004	63.13
2005	63.945
2006	64.979
2007	66.52
2008	63.822
2009	58.044
2010	52.538
2011	51.853
2012	50.804
2013	47.966
2014	48.763
2015	50.408
2016	50.092
2017	51.881
2018	52.345
2019	54.223
2020	52.532
2021	54.351
2022	56.004
2023	55.947