Year	% of cohort
1970	50.0972099304199
1971	49.6879692077637
1972	49.7157516479492
1973	48.4621391296387
1974	49.4279289245605
1975	50.6900100708008
1976	52.3737411499023
1977	54.994499206543
1978	55.9269714355469
1979	56.0783081054688
1980	56.2506484985352
1981	56.9346389770508
1982	57.4839096069336
1983	58.8429489135742
1984	59.5014801025391
1985	60.8207588195801
1986	62.4591407775879
1987	66.2430114746094
1988	66.248291015625
1989	66.1485900878906
1990	66.4564971923828
1991	66.4291763305664
1992	66.356559753418
1993	66.9158935546875
1994	66.3267974853516
1995	67.2279434204102
1996	67.504280090332
1997	67.9187316894531
1998	68.5260696411133
1999	68.949951171875
2000	68.2251586914062
2001	69.9514465332031
2002	70.008659362793
2003	70.6124877929688
2004	71.5118865966797
2005	72.1419296264648
2006	73.0078506469727
2007	72.7196884155273
2008	74.2597122192383
2009	75.6249694824219
2010	75.6423797607422
2011	76.4646072387695
2012	76.5038070678711
2013	78.4136199951172
2014	83.6604614257812
2015	83.3356628417969
2016	82.9362335205078
2017	82.6479110717773
2018	82.4319229125977
2019	86.9859237670898
2020	87.7744216918945
2021	88.9341506958008