Year	% of cohort
1973	72.7763214111328
1974	68.9539184570312
1975	68.0918502807617
1976	69.4092407226562
1977	70.1683731079102
1978	71.3509979248047
1979	72.1438293457031
1980	73.0626525878906
1981	73.1963882446289
1982	72.6869583129883
1983	72.1017684936523
1984	73.4928817749023
1985	73.6005096435547
1986	74.9610366821289
1987	73.8053283691406
1988	74.2203521728516
1989	74.8832931518555
1990	75.0594024658203
1991	73.6411437988281
1992	74.685432434082
1993	78.3472137451172
1994	77.0249481201172
1995	74.8488998413086
1996	75.8371429443359
1997	76.9091415405273
1998	75.9257888793945
1999	75.4834518432617
2000	75.648063659668
2001	74.7815475463867
2002	76.6691513061523
2003	75.6584930419922
2004	75.4264221191406
2005	75.5284423828125
2006	73.9779891967773
2007	76.2064590454102
2008	75.9091567993164
2009	75.3634490966797
2010	74.935173034668
2011	76.5648727416992
2012	75.6024169921875
2013	77.8719024658203
2014	77.875846862793
2015	78.3370819091797
2016	77.7431564331055
2017	78.1335525512695
2018	78.4733428955078
2019	76.5991973876953
2020	75.6456832885742