Year	% of cohort
1983	96.3580474853516
1984	94.2601318359375
1985	95.2404708862305
1986	97.6499786376953
1987	93.1823577880859
1988	97.7500228881836
1989	95.416259765625
1990	97.4083099365234
1991	95.6389007568359
1992	98.7825088500977
1997	96.5964889526367
1998	97.4370193481445
1999	99.0363464355469
2000	97.0092697143555
2001	94.885871887207
2002	98.2681274414062
2003	97.4682922363281
2004	95.4558410644531
2005	96.4890975952148
2006	97.637809753418
2007	98.5636215209961
2008	94.2439498901367
2009	98.4982299804688
2010	97.1508407592773
2011	97.1315994262695
2012	94.0558319091797
2013	97.6228790283203
2014	96.4542694091797
2015	95.8287200927734
2016	94.5495071411133
2017	95.0849075317383
2018	94.9017486572266
2019	94.3747711181641
2020	92.9363327026367