Year	% of cohort
1970	73.9626770019531
1971	74.4709701538086
1972	74.0228118896484
1973	74.4860763549805
1974	76.4111709594727
1975	77.7538604736328
1976	77.2880401611328
1977	78.0181274414062
1978	78.5404510498047
1979	78.3788070678711
1980	78.6701889038086
1981	78.9213714599609
1982	78.9218521118164
1983	77.3062973022461
1984	77.6479568481445
1985	76.8311996459961
1986	77.6740493774414
1987	77.4299087524414
1988	77.4287033081055
1989	76.2065200805664
1990	77.1688613891602
1991	76.0105209350586
1992	76.3320007324219
1993	76.9086380004883
1994	76.1406173706055
1995	75.601921081543
1996	76.3969268798828
1997	75.9927597045898
1998	76.2846603393555
1999	75.5520477294922
2000	75.874397277832
2001	74.982292175293
2002	71.3768463134766
2003	70.1357421875
2004	67.6428375244141
2005	69.5153198242188
2006	56.1448516845703
2007	55.0152702331543
2008	69.918701171875
2009	62.5627212524414
2010	63.3871002197266
2011	64.0852890014648
2012	63.4752006530762
2013	63.8516883850098
2014	63.8171005249023
2015	62.6882781982422
2016	60.4318199157715
2017	61.7777214050293
2018	62.954719543457
2019	63.6869888305664
2020	64.0031204223633
2021	63.1859512329102