Year	% of cohort
1971	76.820182800293
1972	77.6919326782227
1973	78.3120422363281
1974	79.3410873413086
1975	80.4406890869141
1976	80.59423828125
1977	81.1691131591797
1978	81.3598403930664
1979	81.9694290161133
1980	82.5141372680664
1981	83.137321472168
1982	83.0654067993164
1983	85.3694229125977
1984	85.7059326171875
1985	86.4453201293945
1986	86.824089050293
1987	85.7342681884766
1988	84.3563232421875
1989	85.582893371582
1990	86.1808395385742
1991	85.1406936645508
1992	84.9187469482422
1993	85.2632217407227
1994	84.8047485351562
1995	84.474739074707
1996	83.7416915893555
1997	82.6560134887695
1998	82.6110000610352
1999	82.8797378540039
2000	82.8638000488281
2001	82.5063781738281
2002	82.4854431152344
2003	82.5873870849609
2004	80.6037521362305
2005	80.3376007080078
2006	81.4760284423828
2007	82.2566680908203
2008	82.5576629638672
2009	84.0057067871094
2010	83.9848709106445
2011	83.6220397949219
2012	78.9997711181641
2013	77.0418167114258
2014	77.8329467773438
2015	79.8919677734375
2016	79.6407318115234
2017	81.6083297729492
2018	82.7173690795898
2019	83.7416305541992
2020	84.0451889038086
2021	85.5303573608398