Year	% of cohort
1960	52.564598
1961	53.297523
1962	53.931143
1963	54.631415
1964	55.223327
1965	55.882224
1966	56.402457
1967	56.957586
1968	57.583039
1969	58.152926
1970	58.731764
1971	59.345069
1972	59.965124
1973	60.620749
1974	61.113045
1975	61.798549
1976	62.407373
1977	63.106417
1978	63.787841
1979	64.546661
1980	65.332483
1981	66.192211
1982	67.024568
1983	67.786112
1984	68.544205
1985	69.278417
1986	70.08265
1987	70.92092
1988	71.543144
1989	72.267315
1990	73.106924
1991	73.579749
1992	74.285803
1993	74.921602
1994	75.653529
1995	76.336489
1996	77.112008
1997	77.778514
1998	78.382735
1999	78.948355
2000	79.857337
2001	80.628386
2002	80.930314
2003	81.24158
2004	81.931212
2005	82.603856
2006	82.973319
2007	83.286515
2008	83.661211
2009	83.928845
2010	84.377214
2011	84.527448
2012	84.899973
2013	85.324582
2014	85.837334
2015	86.05488
2016	86.435871
2017	86.694925
2018	87.025483
2019	87.320993
2020	84.615778
2021	81.414878
2022	82.974848