Year	% (national estimate)
1960	23.641432133889232
1970	26.38274759559819
1980	32.9678215079933
1990	38.482430508242686
1991	41.26685030483299
1992	45.28005449088085
1993	43.55981371824911
1995	44.52162350170211
1996	44.03863658287694
1997	45.41874089099956
1998	45.300104921779145
1999	45.37539464594897
2001	45.55518939470766
2002	47.273298837153824
2003	46.10835033090635
2004	46.15889606479762
2005	46.34258084938382
2006	46.34775603323368
2007	45.99057552602352
2008	45.22564734186552
2009	45.09294441506705
2011	42.88162771959741
2012	42.12216229761572
2013	40.9784954212694
2014	40.15655157360917
2015	40.684441523454666
2016	41.285091575167854
2017	40.923061867768965
2018	41.21004622577556
2019	41.97495418791694
2020	37.95162390602196
2021	41.73567556971507
2022	41.95887798598858
2023	41.350435076874426