Year	% of cohort
1970	92.8186798095703
1971	92.6726989746094
1972	92.5891265869141
1973	92.7054824829102
1974	93.0223922729492
1975	93.0960006713867
1976	93.1782913208008
1977	93.6853713989258
1978	93.8537368774414
1979	93.9633712768555
1980	94.2026977539062
1981	94.2453536987305
1982	94.4294281005859
1983	94.4174728393555
1984	94.7735137939453
1985	94.7461929321289
1986	94.6555709838867
1987	94.3330307006836
1988	94.4094161987305
1989	94.4344787597656
1990	94.477783203125
1991	94.4914016723633
1992	94.5990982055664
1993	94.6824798583984
1994	94.2938690185547
1995	94.5252990722656
1996	94.1449966430664
1997	94.107292175293
1998	94.7906036376953
1999	94.7008666992188
2000	94.739143371582
2001	94.7866516113281
2002	94.8832473754883
2003	94.9625625610352
2004	94.986198425293
2005	95.0471115112305
2006	94.91552734375
2007	94.8450927734375
2008	94.9085388183594
2009	95.0842666625977
2010	95.2178115844727
2011	95.5237197875977
2012	95.1700592041016
2013	94.6583633422852
2014	94.4019012451172
2015	94.0721817016602
2016	94.1940536499023
2017	94.7091369628906
2018	95.0722122192383
2019	95.3780136108398
2020	94.246208190918
2021	94.2039108276367