Year	% of cohort
1971	94.0631866455078
1972	94.530387878418
1973	93.4541625976562
1974	92.0491714477539
1975	97.3383407592773
1976	98.1040191650391
1977	97.5632629394531
1978	95.9406127929688
1979	92.3013381958008
1980	100
1981	97.1725082397461
1982	99.6035232543945
1983	99.3694534301758
1984	99.7848892211914
1985	98.5259170532227
1986	92.0891494750977
1988	97.7958068847656
1991	99.5672302246094
2004	98.9858932495117
2005	99.1033096313477
2006	97.1508026123047
2010	93.1940078735352
2011	94.2487335205078
2012	91.2003326416016
2013	91.7876510620117
2015	95.6880722045898
2016	98.3764190673828
2017	97.6464233398438
2018	98.9052429199219
2019	99.3424987792969
2020	99.3438720703125