Year	% of cohort
1972	89.5271682739258
1973	88.1494674682617
1974	85.4274978637695
1975	87.6332626342773
1976	85.4916534423828
1977	86.1121597290039
1978	86.5420532226562
1979	87.9608764648438
1980	86.640998840332
1981	87.7682189941406
1982	90.2914199829102
1983	91.2086486816406
1984	93.6484832763672
1985	95.5056610107422
1986	93.5666809082031
1987	93.7593307495117
1988	91.9822616577148
1989	93.4636764526367
1990	94.1977996826172
1991	93.9550933837891
1992	92.4468688964844
1993	93.3025970458984
1994	92.1580276489258
1995	94.3864898681641
1996	94.1186981201172
1998	95.0359115600586
1999	95.0019073486328
2000	97.0923080444336
2001	95.9850463867188
2002	96.9697189331055
2003	96.1852493286133
2004	95.6074829101562
2005	95.1732406616211
2006	95.9814910888672
2007	95.9086303710938
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