Year	% of cohort
1960	48.236161
1961	49.636635
1962	50.833373
1963	52.305083
1964	53.670692
1965	53.438103
1966	53.044694
1967	54.307595
1968	55.252967
1969	56.413241
1970	56.351857
1971	57.347107
1972	57.170303
1973	58.015487
1974	58.494512
1975	59.964286
1976	60.893311
1977	62.48331
1978	63.927394
1979	65.981012
1980	66.571678
1981	66.942873
1982	67.410265
1983	67.820237
1984	68.196706
1985	68.612924
1986	68.984246
1987	69.385566
1988	69.890868
1989	70.368157
1990	71.395008
1991	70.973865
1992	71.338893
1993	71.848236
1994	71.836873
1995	72.101382
1996	71.841538
1997	72.077922
1998	72.336625
1999	72.91991
2000	73.294999
2001	74.311318
2002	74.577032
2003	75.924271
2004	76.709848
2005	76.68138
2006	76.1637
2007	75.895894
2008	75.645336
2009	75.10009
2010	73.971948
2011	73.156433
2012	72.833548
2013	72.811436
2014	72.552107
2015	72.34554
2016	72.806642
2017	73.305644
2018	73.852861
2019	74.42207
2020	73.262287
2021	73.524062
2022	75.261552