Year	% of cohort
1974	80.5782775878906
1975	80.6870498657227
1976	81.5336990356445
1977	82.7236480712891
1978	83.1555099487305
1979	83.1178512573242
1980	86.5232391357422
1981	86.388786315918
1982	84.5700302124023
1983	83.4147796630859
1984	83.2659378051758
1985	83.9851379394531
1986	84.7415008544922
1987	85.1851119995117
1988	86.4081192016602
1989	87.7443008422852
1990	88.9051208496094
1991	88.6917495727539
1992	88.4113464355469
1993	88.1845779418945
1994	88.0939636230469
1995	88.1585998535156
1996	88.1537933349609
1997	88.1361923217773
1998	88.0451202392578
1999	88.0481414794922
2000	84.6583480834961
2001	85.4488525390625
2002	86.1689987182617
2003	86.9665374755859
2004	86.2495498657227
2005	86.7782974243164
2006	86.4504089355469
2007	88.6930084228516
2008	90.3416519165039
2009	87.2539291381836
2010	87.5282211303711
2011	88.0967483520508
2012	87.9301986694336
2013	93.0848693847656
2014	93.336311340332
2015	92.9224395751953
2016	90.1967086791992
2017	93.3499526977539
2018	91.980339050293
2019	79.3831634521484
2020	76.313850402832
2021	74.8912582397461