Year	% (national estimate)
1983	46.854
1984	45.131
1985	43.773
1986	43.789
1987	43.91
1988	43.902
1989	44.229
1990	45.498
1991	44.808
1992	44.678
1993	45.024
1994	46.075
1995	47.468
1996	48.436
1997	49.786
1998	52.102
1999	54.586
2000	56.434
2001	57
2002	57.085
2003	57.021
2004	57.369
2005	58.862
2006	60.009
2007	63.307
2008	61.472
2009	56.006
2010	53.502
2011	52.449
2012	52.114
2013	53.453
2014	54.431
2015	55.691
2016	56.971
2017	57.818
2018	58.594
2019	59.253
2020	57.684
2021	59.587
2022	61.728
2023	62.681