Year	% of cohort
1970	76.3883590698242
1971	69.0624237060547
1972	73.1062088012695
1973	71.2899780273438
1974	68.8526229858398
1975	69.2826232910156
1976	74.7731704711914
1982	96.1449584960938
1996	99.1266479492188
2010	97.6268997192383
2011	99.3583984375
2013	99.9510498046875
2014	99.9473571777344
2015	100
2016	99.9019088745117
2017	99.602180480957
2018	99.971061706543
2019	98.4065399169922
2020	99.0921325683594