Year	% (national estimate)
1975	74.3
1990	76.151
1991	74.292
1992	70.305
1993	65.832
1994	65.311
1995	64.888
1996	58.594
1997	58.135
1998	59.2
1999	60.097
2000	60.708
2001	63.645
2002	63.226
2003	62.696
2004	61.871
2005	62.005
2006	62.935
2007	63.812
2008	64.139
2009	61.489
2010	67.465
2011	68.139
2012	67.863
2013	68.165
2014	68.609
2015	68.806
2016	68.966
2017	69.912
2018	70.361
2019	70.516
2020	69.775
2021	64.017
2022	65.353
2023	65.415