Year	% of cohort
1972	68.7004470825195
1973	70.553352355957
1974	70.2151489257812
1975	72.9314117431641
1976	71.1714096069336
1977	72.5397415161133
1978	73.9223709106445
1979	74.8707733154297
1980	75.8917083740234
1981	76.6404724121094
1982	79.3549270629883
1983	83.6768798828125
1984	86.7524108886719
1985	93.4094390869141
1986	90.3184967041016
1987	90.7889709472656
1988	88.2722702026367
1989	89.8335494995117
1990	90.1931610107422
1991	90.2505874633789
1992	88.6117172241211
1993	90.1267318725586
1994	88.1504821777344
1995	89.8580093383789
1996	90.3833236694336
1998	92.0394592285156
1999	91.455810546875
2000	94.5637283325195
2001	93.4847412109375
2002	94.5169372558594
2003	93.4622421264648
2004	93.2031326293945
2005	90.9196395874023
2006	92.0112533569336
2007	92.9523315429688
2009	95.0389709472656
2010	94.5525588989258
2011	92.7675170898438
2012	96.2097930908203
2013	93.4130020141602
2014	93.8004531860352
2015	93.5985107421875
2016	94.8499526977539
2017	96.265007019043
2018	91.5572509765625
2020	88.9655227661133
2021	92.6793823242188