Year	% of cohort
1971	49.762149810791
1972	50.3713111877441
1973	51.38671875
1974	52.4861297607422
1975	53.0198783874512
1976	54.011360168457
1977	54.6703605651855
1978	54.0547981262207
1979	52.8998413085938
1980	52.3762512207031
1981	51.7418403625488
1982	51.7927284240723
1983	53.0845985412598
1984	53.6775207519531
1985	54.4118385314941
1986	54.9274597167969
1987	53.5621185302734
1988	52.3759803771973
1989	52.8605308532715
1990	53.7411193847656
1991	52.564208984375
1992	54.505069732666
1993	52.5151100158691
1994	51.2150611877441
1995	52.402271270752
1996	51.2008094787598
1997	51.8298301696777
1998	50.7429313659668
1999	54.1125907897949
2000	55.8985290527344
2001	54.6894111633301
2002	54.7244491577148
2003	53.628360748291
2004	56.2719917297363
2005	56.6954307556152
2006	57.021900177002
2007	56.7600708007812
2008	55.4926986694336
2009	51.0005493164062
2010	50.2833518981934
2011	53.2931785583496
2012	50.1291885375977
2013	50.5316009521484
2014	51.2088813781738
2015	52.5460014343262
2016	52.8181381225586
2017	53.4553909301758
2018	55.785041809082
2019	56.9224586486816
2020	58.0559616088867
2021	57.8935203552246