Year	% of cohort
1973	98.1157073974609
1974	98.4154663085938
1975	96.1505966186523
1976	99.085823059082
1977	98.6691284179688
1978	98.9775695800781
1979	99.0156478881836
1980	99.4392700195312
1981	99.2721176147461
1984	99.1124572753906
1985	99.5279083251953
1986	98.5123825073242
1987	99.7621383666992
1988	99.7126007080078
1989	97.3759994506836
1990	98.6558837890625
1991	99.1235809326172
1992	97.7569580078125
1998	99.5468673706055
1999	99.6602401733398
2000	98.8239212036133
2001	98.326042175293
2002	99.7807693481445
2003	98.6819915771484
2004	99.8569793701172
2005	98.9011535644531
2006	100
2007	98.7686614990234
2008	99.8917388916016
2009	99.3346633911133
2010	99.4931488037109
2011	97.3899536132812
2013	99.3929214477539
2014	99.4233322143555
2015	99.6096267700195
2016	99.3833389282227
2017	99.2849807739258
2018	99.320671081543
2019	98.6229476928711
2020	99.1035232543945