Year	% of cohort
1971	60.0772895812988
1972	74.4974822998047
1973	76.039176940918
1974	81.9214324951172
1975	82.6580276489258
1976	83.4649429321289
1977	83.8127670288086
1980	83.2177124023438
1981	85.9852905273438
1982	87.883056640625
1983	89.9821929931641
1984	90.7505722045898
1985	90.498420715332
1986	92.1733093261719
1987	90.7814483642578
1988	89.3873291015625
1989	88.243293762207
1990	88.9433517456055
1991	89.6611022949219
1992	92.2723999023438
1993	93.3156127929688
1994	92.2481231689453
1999	94.6766510009766
2000	96.0193405151367
2001	96.8059997558594
2002	96.6464920043945
2003	96.5870819091797
2004	96.806770324707
2005	96.8900299072266
2006	96.8150863647461
2007	96.086540222168
2008	95.4990005493164
2009	96.1526412963867
2010	95.0407104492188
2011	96.4771270751953
2012	95.7932815551758
2013	96.4551315307617
2014	94.623908996582
2015	95.5262222290039
2016	95.7641906738281
2017	96.4014663696289
2018	96.7257919311523
2019	95.9702911376953
2020	97.2715072631836
2021	94.3658981323242