Year	% of cohort
1970	68.5683212280273
1971	67.484619140625
1972	67.0567626953125
1973	66.3686676025391
1974	66.3641891479492
1975	67.3560485839844
1976	68.1311492919922
1977	69.4143524169922
1978	69.0608367919922
1979	69.1914520263672
1980	68.7967529296875
1981	69.212028503418
1982	69.4461288452148
1983	69.8090667724609
1984	69.7043685913086
1985	70.4098968505859
1986	71.4954986572266
1987	73.0267181396484
1988	73.1690063476562
1989	73.2275390625
1990	74.4445724487305
1991	74.6316604614258
1992	74.9086380004883
1993	75.468147277832
1994	75.6587524414062
1995	76.4703979492188
1996	76.4402008056641
1997	76.5558700561523
1998	76.4350509643555
1999	76.4913101196289
2000	76.147590637207
2001	77.2910690307617
2002	76.8866729736328
2003	76.469108581543
2004	76.6207275390625
2005	76.9052963256836
2006	76.6974411010742
2007	76.6006164550781
2008	78.1461029052734
2009	77.9803771972656
2010	77.7405319213867
2011	78.6594924926758
2012	78.0465621948242
2013	78.7557983398438
2014	81.3134613037109
2015	81.3081970214844
2016	80.9752502441406
2017	81.4993133544922
2018	81.3548202514648
2019	83.6213989257812
2020	83.8547286987305
2021	84.4160003662109