Year	% of cohort
1971	67.2197723388672
1972	66.77001953125
1973	66.1807479858398
1974	66.1895904541016
1975	67.1375427246094
1976	67.7890472412109
1977	68.9611434936523
1978	68.6668167114258
1979	68.8021392822266
1980	68.418830871582
1981	68.9178009033203
1982	68.925910949707
1983	69.3307495117188
1984	69.2279205322266
1985	69.981086730957
1986	71.1565704345703
1987	72.7999801635742
1988	73.0384674072266
1989	73.0851593017578
1990	74.2805480957031
1991	74.4531936645508
1992	74.7569580078125
1993	75.2853088378906
1994	75.3880386352539
1995	76.1081085205078
1996	76.0150909423828
1997	76.0223999023438
1998	75.7708435058594
1999	75.8895416259766
2000	75.321403503418
2001	76.1249694824219
2002	76.0425033569336
2003	75.7122116088867
2004	75.9156265258789
2005	76.0491180419922
2006	76.0076599121094
2007	75.9821014404297
2008	77.5920562744141
2009	77.3145904541016
2010	77.0731735229492
2011	77.9304428100586
2012	77.3619003295898
2013	77.8924026489258
2014	80.2479095458984
2015	80.1244430541992
2016	80.201530456543
2017	80.8532791137695
2018	80.1884536743164
2019	82.499870300293
2020	82.9326477050781
2021	83.5297698974609