Year	% (national estimate)
1979	51.3
1980	51.08
1981	51.24
1982	51.16
1985	29.36
1986	30.75
1990	56.3
1991	54.4
1992	53.3
1993	55.3
1994	55.7
1995	59.3
1997	71.337
1998	69.598
1999	68.803
2000	69.111
2001	67.875
2002	74.177
2003	67.439
2004	72.185
2005	69.552
2006	72.963
2007	75.037
2008	75.074
2009	75.463
2010	76.392
2011	75.917
2012	75.919
2013	75.079
2014	74.592
2015	73.42
2016	72.557
2017	74.154
2018	74.484
2019	74.748
2020	63.976
2021	68.264
2022	71.277
2023	69.125