Year	% of cohort
1974	74.3711166381836
1975	72.9716491699219
1976	73.9456176757812
1977	72.4412307739258
1978	75.4068069458008
1979	76.7649993896484
1980	78.8378829956055
1981	77.0828399658203
1982	73.276741027832
1983	72.4648895263672
1984	77.815788269043
1985	82.0871505737305
1986	83.1184616088867
1987	82.8472290039062
2005	96.9451675415039
2006	97.0674591064453
2007	92.0213165283203
2008	97.4914169311523
2009	100
2012	100
2013	96.6243133544922
2014	97.4326400756836
2015	98.7491226196289
2016	97.0242004394531
2017	97.939697265625
2018	97.9830627441406
2019	98.0548477172852
2020	97.8150405883789