Year	% (national estimate)
1991	60.27
1993	55.61
1994	52.727
1995	51.972
1996	50.873
1997	51.772
1998	48.67
1999	48.291
2000	47.002
2001	47.71
2002	46.215
2003	44.236
2004	42.543
2005	40.634
2006	39.58
2007	38.907
2008	37.842
2009	37.021
2010	36.219
2011	37.168
2012	37.067
2013	37.57
2014	38.31
2015	38.366
2016	39.769
2017	39.565
2018	39.691
2019	36.778
2020	34.902
2021	32.106
2022	32.688
2023	32.643