Year	% of cohort
1960	46.161747
1961	47.125753
1962	48.036406
1963	48.885304
1964	49.647539
1965	50.31974
1966	50.917348
1967	51.46419
1968	51.975588
1969	52.478738
1970	52.98984
1971	53.502847
1972	53.975657
1973	54.36934
1974	54.651006
1975	54.787088
1976	54.817983
1977	54.841022
1978	54.961411
1979	55.292564
1980	55.942608
1981	56.898203
1982	58.03956
1983	59.258261
1984	60.443305
1985	61.498928
1986	62.391535
1987	63.140414
1988	63.757658
1989	64.26365
1990	64.678536
1991	65.038937
1992	65.385247
1993	65.785906
1994	66.287239
1995	66.954891
1996	67.773771
1997	68.691638
1998	69.629487
1999	70.53397
2000	71.345349
2001	72.027887
2002	72.56467
2003	72.941667
2004	73.146638
2005	73.14839
2006	73.015976
2007	72.773742
2008	72.526586
2009	72.381757
2010	72.447107
2011	72.732401
2012	73.089328
2013	73.369127
2014	73.431959
2015	73.148393
2016	72.51187
2017	71.79355
2018	71.303555
2019	71.382328
2020	60.483609
2021	59.745846
2022	72.53396