Year	% of people ages 15 and above
1972	39.6233100891113
1973	40.100528717041
1974	40.5882797241211
1975	41.125358581543
1976	41.7029800415039
1977	42.2836685180664
1978	42.9994010925293
1979	43.714298248291
1980	44.5587501525879
1981	45.4087715148926
1982	46.2227592468262
1983	47.0912284851074
1984	48.0327987670898
1985	49.1833000183105
1986	50.2370300292969
1987	51.155689239502
1988	52.2937088012695
1989	53.3133583068848
1990	55.9071884155273
1991	57.3358192443848
1992	58.3514404296875
1993	59.2031288146973
1994	59.9660797119141
1995	61.6653289794922
1996	63.0276794433594
1997	63.943000793457
1998	65.1288986206055
1999	66.2508773803711
2000	67.3256683349609
2001	68.4827270507812
2002	68.9154205322266
2003	72.4099731445312
2004	73.1119918823242
2005	72.6936111450195
2006	72.6380310058594
2007	73.2388229370117
2008	73.7248687744141
2009	73.5307083129883
2010	74.3127136230469
2011	74.5015563964844
2012	77.3770904541016
2013	75.0229415893555
2014	79.2574005126953
2015	76.7205123901367
2016	77.888313293457
2017	78.9528732299805
2018	75.8960876464844
2019	76.2772064208984
2020	76.6375274658203
2021	77.0044479370117
2022	77.3994979858398