Year	% of cohort
1970	92.8506088256836
1971	92.7931671142578
1972	93.0916137695312
1973	93.2507019042969
1974	93.234748840332
1975	93.4274368286133
1976	93.8870620727539
1977	94.4362182617188
1978	94.3611526489258
1979	94.1495666503906
1980	94.6765670776367
1981	94.8507614135742
1982	94.711540222168
1983	95.2519378662109
1984	96.1365509033203
1985	96.2477111816406
1986	95.8587265014648
1987	95.2100296020508
1988	95.8202285766602
1989	96.1537170410156
1990	96.2868499755859
1991	96.3948287963867
1992	96.3518829345703
1993	96.5482025146484
1994	96.5879821777344
1995	96.8837280273438
1996	96.9456405639648
1997	96.9330215454102
1998	97.036376953125
1999	97.1169128417969
2000	97.4231491088867
2001	97.5137405395508
2002	97.6862869262695
2003	98.0077590942383
2004	98.2232666015625
2005	98.0972518920898
2006	98.0254669189453
2007	97.5963592529297
2008	97.7251129150391
2009	97.1212692260742
2010	97.3125686645508
2011	97.2734298706055
2012	97.0485076904297
2013	97.1631622314453
2014	97.4013900756836
2015	97.729606628418
2016	97.9957122802734
2017	97.9963684082031
2018	98.0224304199219
2019	98.0303497314453
2020	97.9735717773438
2021	97.9661636352539