Year	% of cohort
1975	95.8803863525391
1976	95.3472366333008
1977	96.1665496826172
1978	95.2338790893555
1979	97.2333602905273
1980	95.9253768920898
1981	96.0466537475586
1982	96.9928207397461
1983	96.779296875
1984	96.4946517944336
1985	96.5899124145508
1986	96.04443359375
1987	96.7169036865234
1988	97.0349273681641
1989	97.9426422119141
1996	95.2241134643555
1997	92.6480178833008
1998	95.4341278076172
1999	95.3870620727539
2000	93.6961135864258
2001	95.9369583129883
2002	96.7782363891602
2003	97.0231094360352
2004	97.5993881225586
2005	97.7781829833984
2006	97.6578674316406
2007	98.5554122924805
2008	97.5300369262695
2009	98.1225662231445
2010	98.3475875854492
2011	98.3457183837891
2012	98.0620498657227
2013	98.0488662719727
2014	97.8564682006836
2015	98.385139465332
2016	96.9035568237305
2017	98.6847991943359
2018	98.640983581543
2019	98.696907043457
2020	98.6315536499023