Year	% of cohort
1971	63.5446281433105
1972	63.1772804260254
1973	62.5856513977051
1974	62.5398101806641
1975	63.800220489502
1976	64.6035079956055
1977	65.9432373046875
1978	65.6940612792969
1979	65.8356781005859
1980	65.5028762817383
1981	66.0006484985352
1982	66.0981597900391
1983	66.6252975463867
1984	66.4481201171875
1985	67.235221862793
1986	68.4861602783203
1987	70.3722076416016
1988	70.6012573242188
1989	70.7230911254883
1990	72.0538330078125
1991	72.2974472045898
1992	72.7109603881836
1993	73.3124923706055
1994	73.4489974975586
1995	74.2593002319336
1996	74.1907272338867
1997	74.1799621582031
1998	73.7902069091797
1999	73.9478988647461
2000	73.3481979370117
2001	74.2452163696289
2002	74.1699295043945
2003	73.794677734375
2004	74.0565414428711
2005	74.208610534668
2006	74.168830871582
2007	74.1600494384766
2008	75.8836517333984
2009	75.6157379150391
2010	75.3438720703125
2011	76.2956390380859
2012	75.7323989868164
2013	76.3399505615234
2014	78.9797210693359
2015	78.7831802368164
2016	78.8727188110352
2017	79.5798187255859
2018	78.8757781982422
2019	81.391227722168
2020	81.9532775878906
2021	82.6524963378906