Year	% of cohort
1971	95.5644912719727
1972	96.2390365600586
1973	95.0530471801758
1974	93.6618499755859
1975	98.0306625366211
1976	98.5120315551758
1977	97.8760681152344
1978	96.6548919677734
1979	93.4335021972656
1980	100
1981	97.7268600463867
1982	99.7553405761719
1983	99.4017105102539
1984	99.9097595214844
1985	98.9647064208984
1986	93.5553436279297
1988	98.1207885742188
1991	99.5693969726562
2004	98.9858932495117
2005	99.1033096313477
2006	97.3861465454102
2010	94.1327285766602
2011	95.0616836547852
2012	92.5262222290039
2013	93.2315826416016
2015	96.0551376342773
2016	98.7783203125
2017	98.0155487060547
2018	99.4169006347656
2019	99.7180328369141
2020	99.4883575439453