Year	% of cohort
1972	60.7855796813965
1973	62.5505104064941
1974	69.3067092895508
1975	63.6093597412109
1976	57.3977203369141
1977	67.9014205932617
1978	65.7957305908203
1979	67.8979721069336
1980	72.8505020141602
1981	70.1836166381836
1982	75.2019424438477
1983	63.6351890563965
1984	75.0738830566406
1985	72.7736129760742
1986	76.0907516479492
1990	64.2654876708984
2006	77.0427093505859
2007	62.7301216125488
2008	76.8891220092773
2009	76.0729293823242
2010	67.4605178833008
2011	77.6282119750977
2014	77.972282409668
2015	70.7674331665039
2016	54.800651550293
2017	50.9878692626953
2018	76.7916793823242
2021	78.3672103881836