Year	% of cohort
1971	63.3317985534668
1972	63.0756683349609
1973	62.2547607421875
1974	62.1633186340332
1975	63.611141204834
1976	64.7716903686523
1977	66.3952789306641
1978	66.041130065918
1979	66.1865234375
1980	65.7798461914062
1981	66.2025299072266
1982	66.8708572387695
1983	67.2592926025391
1984	67.0781707763672
1985	67.8294372558594
1986	68.8906326293945
1987	70.5432968139648
1988	70.5502700805664
1989	70.7195434570312
1990	72.131462097168
1991	72.4389190673828
1992	72.796142578125
1993	73.4789733886719
1994	73.8325500488281
1995	74.9090881347656
1996	74.970703125
1997	75.2058563232422
1998	75.1477737426758
1999	75.1627197265625
2000	75.0866470336914
2001	76.8098297119141
2002	75.9861907958984
2003	75.3949432373047
2004	75.5235137939453
2005	76.0170822143555
2006	75.6074676513672
2007	75.4267272949219
2008	77.0280380249023
2009	76.9898376464844
2010	76.7044982910156
2011	77.7579116821289
2012	77.0697937011719
2013	78.0799407958984
2014	81.1992263793945
2015	81.4182510375977
2016	80.5059509277344
2017	80.9068298339844
2018	81.3880004882812
2019	83.8187026977539
2020	83.9461517333984
2021	84.5579071044922