Year	% of cohort
1972	63.4976387023926
1973	68.0902481079102
1974	75.1130065917969
1976	80.3788223266602
1977	82.7811737060547
1978	84.1676025390625
1979	81.734260559082
1980	80.1799392700195
1981	80.686653137207
1982	76.2953796386719
1983	82.1260681152344
1984	69.0142669677734
1985	68.3854370117188
1986	70.3075485229492
1987	67.1334686279297
1988	63.2788887023926
1989	75.320182800293
1990	73.6230621337891
1991	67.4736709594727
1992	73.6863708496094
1993	73.1045684814453
1994	74.6973190307617
1995	72.9176025390625
1996	68.7755584716797
1997	68.2557373046875
1998	69.449462890625
1999	74.7505493164062
2000	72.2290496826172
2001	78.2651977539062
2002	76.1747512817383
2003	71.0211334228516
2004	75.1293792724609
2005	75.6909866333008
2006	78.6989517211914
2007	76.6885223388672
2008	77.8170013427734
2009	90.5806503295898
2010	89.7958602905273
2011	88.6519927978516
2012	91.7881164550781
2013	89.6884536743164
2014	90.6677093505859
2015	92.0919570922852
2016	94.7257308959961
2017	92.3504104614258
2018	93.5220489501953
2019	94.1799926757812
2020	91.5322418212891
2021	97.5229110717773