Year	% of cohort
1974	66.028923034668
1975	74.4401779174805
1976	78.5458908081055
1978	93.9971618652344
1981	89.8530502319336
1982	91.2656173706055
1983	90.9558563232422
1984	92.3861312866211
1985	92.7388381958008
1986	93.3745880126953
1988	95.3850631713867
1989	90.7633666992188
1990	94.373176574707
1991	92.2049331665039
2001	97.7851409912109
2002	98.060432434082
2005	98.7358627319336
2006	98.6328964233398
2010	97.3305130004883
2011	96.5749130249023
2012	98.4725875854492
2013	98.2640228271484
2014	99.1807022094727
2015	98.3890228271484
2016	98.4699401855469
2018	98.8301391601562
2019	98.7121734619141