Year	% (national estimate)
1961	27.54
1972	21.33
1979	27.87
1980	28.1
1981	23.28
1982	28.7
1984	37.43
1986	43.12
1987	43.76
1989	42.71
1990	41.1
1991	37.73
1992	37.8
1993	29.97
1994	41.16
1995	44.6
1997	57.836
1998	56.451
1999	58.1
2000	57.302
2001	51.965
2002	74.387
2003	60.259
2004	62.755
2005	57.363
2006	59.884
2007	62.226
2008	63.528
2009	63.143
2010	64.221
2011	62.446
2012	61.995
2013	60.977
2014	58.849
2015	55.556
2016	56.013
2017	57.86
2018	57.777
2019	57.793
2020	50.308
2021	54.203
2022	55.674
2023	52.817