Year	% of cohort
1972	86.2265014648438
1973	82.1871719360352
1974	85.0470581054688
1975	79.4280471801758
1976	93.7642822265625
1977	92.3122100830078
1978	93.138542175293
1979	88.993293762207
1980	89.4426498413086
1981	83.325439453125
1982	82.7889099121094
1983	74.5695190429688
1984	70.8415908813477
1985	72.9800796508789
1986	74.7750778198242
1987	76.9220886230469
1988	80.3813400268555
1989	75.0258026123047
1990	67.708137512207
1991	72.9793319702148
1992	61.3695907592773
1993	84.0097198486328
1994	74.2682800292969
1995	72.6622924804688
1996	71.8802871704102
1997	69.8198699951172
1998	83.0844268798828
1999	69.2493209838867
2000	88.9145431518555
2006	78.5929107666016
2008	66.0550231933594
2011	84.8147201538086
2012	78.3567428588867
2013	76.2742233276367
2014	83.8606719970703
2015	83.5438766479492
2016	75.1137008666992
2017	60.0106010437012
2019	79.7251281738281
2020	76.0963973999023
2021	68.0376586914062