Year	% of cohort
1972	71.181282043457
1973	75.4308624267578
1974	74.3488082885742
1975	76.3823776245117
1976	73.3460998535156
1977	75.0270233154297
1978	75.0852279663086
1979	77.1392288208008
1980	79.56884765625
1981	78.6893463134766
1982	80.9635620117188
1983	85.7477188110352
1984	88.2248306274414
1985	95.4024963378906
1986	92.8028411865234
1987	92.8892364501953
1988	90.1896133422852
1989	92.2475433349609
1990	92.2259063720703
1991	91.099853515625
1992	89.0546722412109
1993	90.2512969970703
1994	88.8347702026367
1995	89.7273864746094
1996	89.3067626953125
1998	91.2177810668945
1999	89.8870315551758
2000	93.7542724609375
2001	91.567626953125
2002	93.5414505004883
2003	91.6427764892578
2004	91.4361114501953
2005	89.7631378173828
2006	89.5404968261719
2007	91.3434829711914
2009	93.155158996582
2010	94.0105514526367
2011	91.1180191040039
2012	94.8486785888672
2013	92.3475570678711
2014	93.0100326538086
2015	93.1571197509766
2016	93.7827911376953
2017	95.3304595947266
2018	91.2359771728516
2020	90.1042633056641
2021	91.9202423095703