Year	% of cohort
1978	86.5049591064453
1979	85.2717590332031
1980	81.4657669067383
1981	82.0041122436523
1982	84.8895568847656
1983	82.9841003417969
1984	82.2331008911133
1985	82.841796875
1986	82.7140884399414
1987	82.5045700073242
1988	82.3123474121094
1989	81.942138671875
1990	81.8580627441406
1991	80.800163269043
1992	78.6852569580078
1993	78.7430267333984
1994	78.5054168701172
1995	78.1906890869141
1996	79.8515319824219
1997	79.3242492675781
1998	79.5136566162109
1999	78.920539855957
2000	78.8042526245117
2001	77.3969879150391
2002	79.892578125
2003	82.3832931518555
2004	81.7479400634766
2005	81.7787399291992
2006	81.6916427612305
2007	81.7949066162109
2008	81.8770065307617
2009	81.6721878051758
2010	81.8367080688477
2011	79.3284301757812
2012	84.1288299560547
2013	84.239143371582
2014	82.3668518066406
2015	85.3581390380859
2016	81.9840698242188
2017	78.57080078125
2018	80.4339218139648
2019	77.3018112182617
2020	76.3774108886719