Year	% (national estimate)
1960	23.788950838419346
1970	26.322837001435627
1980	32.518127363735005
1990	37.10628357195424
1991	39.707337857982516
1992	43.381079608663484
1993	41.702006825131015
1995	42.90854251711033
1996	42.65195769340732
1997	44.180183259425434
1998	44.16524656348207
1999	44.70478684202738
2001	44.66748963372419
2002	46.114026414846364
2003	45.20360911526648
2004	45.467024149173234
2005	45.05613577797836
2006	44.880969692321834
2007	44.50956145045288
2008	43.89093570684061
2009	43.82585720052194
2011	41.59949271649125
2012	40.91245960026092
2013	40.66038574165457
2014	39.87661887962289
2015	40.29828729860309
2016	39.86377220182168
2017	40.060331152035744
2018	40.87245739417913
2019	41.560279943096035
2020	37.11019712596698
2021	41.09385635334862
2022	41.434418784559334
2023	40.872372255267685