Year	% of cohort
1980	95.7408294677734
1981	95.1402206420898
1982	96.3158798217773
1983	96.8702087402344
1984	96.4081268310547
1987	96.3651504516602
1988	95.7812118530273
1989	95.8403015136719
1990	96.6384124755859
1992	95.6846771240234
2002	96.7824325561523
2005	100
2006	99.8652420043945
2013	94.6925430297852
2014	92.3962631225586
2016	97.3129501342773
2017	93.3860321044922
2018	91.713249206543
2019	98.8079071044922
2020	97.594108581543