Year	% of cohort
1975	81.1864318847656
1976	81.25634765625
1999	99.4787063598633
2000	99.2419128417969
2001	95.2208023071289
2002	98.1015396118164
2003	98.9686889648438
2005	94.7566833496094
2009	97.7361907958984
2016	97.8557891845703
2018	99.7465362548828
2019	99.9692535400391
2020	100