Year	% of people ages 15 and above
1972	39.2567596435547
1973	39.7379188537598
1974	40.2297210693359
1975	40.7712516784668
1976	41.3536605834961
1977	41.939151763916
1978	42.6608200073242
1979	43.3816413879395
1980	44.2330894470215
1981	45.0901412963867
1982	45.9108810424805
1983	46.786548614502
1984	47.7359199523926
1985	48.8959503173828
1986	49.9584083557129
1987	50.8846817016602
1988	52.0321311950684
1989	53.060230255127
1990	55.6755485534668
1991	57.1151313781738
1992	58.136791229248
1993	58.9860687255859
1994	59.7447891235352
1995	61.4497604370117
1996	62.8152809143066
1997	63.7425689697266
1998	64.9189300537109
1999	66.0451889038086
2000	67.1240005493164
2001	68.286003112793
2002	68.7002410888672
2003	72.2226181030273
2004	72.9318008422852
2005	72.5007934570312
2006	72.4425811767578
2007	73.0445785522461
2008	73.5309295654297
2009	73.3286285400391
2010	74.1133193969727
2011	74.2989196777344
2012	77.1940002441406
2013	74.81005859375
2014	79.0837326049805
2015	76.5160827636719
2016	77.691162109375
2017	78.7626266479492
2018	75.6685409545898
2019	76.0508422851562
2020	76.4127807617188
2021	76.7805404663086
2022	77.1763610839844