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	74.6281890869141
1992	79.9761505126953
1993	79.1430282592773
1994	80.3912200927734
1995	79.3560562133789
1996	75.8920288085938
1997	75.9046173095703
1998	76.7788314819336
1999	81.7930374145508
2000	79.18212890625
2001	84.2854537963867
2002	82.0838928222656
2003	77.1301193237305
2004	81.3185501098633
2005	81.6992721557617
2006	84.5645980834961
2007	83.1026306152344
2008	83.8771667480469
2009	93.9457168579102
2010	93.1001815795898
2011	91.7220993041992
2012	94.1149673461914
2013	92.7459030151367
2014	94.0339431762695
2015	95.1265335083008
2016	97.0581817626953
2017	95.0619812011719
2018	95.8258972167969
2019	96.2167434692383
2020	93.9899063110352
2021	98.3760833740234