Year	% (national estimate)
1990	59.432
1991	58.337
1992	57.038
1993	53.704
1994	55.278
1995	51.114
1996	46.479
1997	40.538
1998	38.732
1999	33.447
2000	33.606
2001	31.759
2002	30.961
2003	36.989
2004	34.417
2005	34.521
2006	36.788
2007	38.236
2008	38.885
2009	29.973
2010	26.483
2011	33.092
2012	34.16
2013	34.033
2014	33.403
2015	37.064
2016	36.524
2017	39.108
2018	41.284
2019	39.235
2020	34.989
2021	33.082
2022	32.659
2023	33.421