Year	% of cohort
1977	78.702392578125
1978	73.7964477539062
1979	73.7985000610352
1980	54.9875984191895
1981	74.1008911132812
1982	73.1091690063477
1983	73.0027618408203
1984	72.4959869384766
1985	72.7261505126953
1986	73.3816070556641
2015	99.5249633789062
2016	99.6182174682617
2017	99.7245101928711
2018	99.4950332641602
2019	99.7342529296875
2020	99.6015319824219
2021	99.6883163452148