Year	% of cohort
1986	97.6907577514648
1987	96.6478118896484
1988	96.6499786376953
1989	99.2778015136719
1990	98.6568832397461
1991	99.8717803955078
1992	99.7331619262695
1993	99.8223724365234
1994	99.2959289550781
1995	99.4481887817383
1997	98.734130859375
1998	99.4922409057617
1999	99.3247680664062
2000	100
2001	99.5979309082031
2002	99.8951797485352
2003	99.8477401733398
2004	99.9979400634766
2005	100
2006	99.4560775756836
2007	99.7967300415039
2008	99.2776184082031
2009	99.9114990234375
2010	99.3671722412109
2011	99.9836120605469
2012	99.5574264526367
2013	99.7701721191406
2014	99.9605178833008
2015	99.8962631225586
2016	99.9812393188477
2017	99.6458129882812
2018	99.4460983276367
2019	99.654411315918
2020	99.9789123535156
2021	99.1012878417969