Year	% of cohort
1972	93.6500091552734
1973	92.8625183105469
1974	94.6797409057617
1975	94.6564636230469
1976	95.3354110717773
1977	93.2135162353516
1978	91.6227569580078
1979	94.5224075317383
1981	86.7375106811523
1983	93.6434478759766
2008	98.8165817260742
2016	98.4272384643555
2017	99.3621368408203
2018	99.7316513061523
2019	99.890266418457
2020	100