Year	% (national estimate)
1980	24.66
1981	24.03
1982	24.87
1985	22.99
1986	22.3
1987	22.11
1989	38.84
1990	42.858
1991	43.84
1992	43.623
1993	41
1994	43.1
1995	52.33
1996	75.21
1997	32.93
1999	58.293
2000	60.11
2001	61.7
2002	57.6
2003	60.7
2004	60.7
2005	56.899
2006	60.292
2007	40.96
2008	60.334
2009	60.613
2011	60.451
2012	56.468
2013	57.378
2014	59.684
2015	52.781
2016	54.817
2017	56.935
2018	61.486
2019	63.757
2020	53.798
2021	67.188
2022	68.856