Year	% of cohort
1980	96.9159622192383
1981	96.8677368164062
1982	97.4986267089844
1983	98.3529586791992
1984	97.1322708129883
1987	97.9618835449219
1988	97.4928436279297
1989	97.5023880004883
1990	98.308967590332
1992	96.945426940918
2001	87.272819519043
2002	97.4756622314453
2004	99.9704818725586
2005	100
2006	99.8652420043945
2013	95.7355117797852
2014	92.3962631225586
2016	97.9125518798828
2017	94.8503112792969
2018	93.4228591918945
2019	99.2357635498047
2020	98.5189514160156