Year	% of cohort
1977	78.3715515136719
1978	73.9359588623047
1979	73.8153610229492
1980	51.9065208435059
1981	74.3092269897461
1982	72.8628692626953
1983	73.0088806152344
1984	72.4896697998047
1985	73.1164093017578
1986	73.5195236206055
2016	99.6190185546875
2017	99.5615692138672
2018	99.3577575683594
2019	100
2020	99.6396713256836
2021	99.5809631347656