Year	% of cohort
1974	77.3143692016602
1975	77.3932037353516
1976	78.2796783447266
1977	79.2131118774414
1978	80.8734893798828
1979	80.4972915649414
1980	83.4864883422852
1981	82.8898391723633
1982	81.0801620483398
1983	79.9097137451172
1984	79.3992309570312
1985	79.5302734375
1986	79.7708282470703
1987	79.7130126953125
1988	80.8844299316406
1989	82.2769927978516
1990	83.5122222900391
1991	83.4615097045898
1992	83.4255828857422
1993	83.3668594360352
1994	83.4623031616211
1995	83.6700973510742
1996	83.8200302124023
1997	83.9547882080078
1998	84.0267868041992
1999	84.1905212402344
2000	81.1063690185547
2001	82.106689453125
2002	82.9400863647461
2003	83.8748168945312
2004	83.2944183349609
2005	83.9572067260742
2006	83.9131927490234
2007	86.3864593505859
2008	87.9691162109375
2009	85.7148284912109
2010	85.6804733276367
2011	86.9570236206055
2012	87.3053207397461
2013	90.8302993774414
2014	91.3147125244141
2015	91.0431289672852
2016	88.354133605957
2017	91.5375595092773
2018	90.4537887573242
2019	81.77197265625
2020	79.8166198730469
2021	78.9636993408203