Year	% of cohort
1960	30.860024
1961	30.906924
1962	30.937422
1963	30.787478
1964	30.773899
1965	30.863552
1966	30.896856
1967	31.119807
1968	31.392362
1969	31.665702
1970	31.913687
1971	32.255384
1972	32.866526
1973	33.926468
1974	34.48946
1975	35.482769
1976	36.56448
1977	37.69373
1978	38.798014
1979	39.948648
1980	41.057585
1981	41.831487
1982	42.782709
1983	43.357065
1984	44.370613
1985	45.207491
1986	46.726762
1987	47.905588
1988	48.993114
1989	49.783324
1990	50.449726
1991	50.920538
1992	50.958541
1993	50.909005
1994	51.253984
1995	51.285996
1996	51.224926
1997	50.964415
1998	50.716319
1999	51.423709
2000	51.8855
2001	52.642614
2002	53.750842
2003	54.591732
2004	56.099086
2005	57.315985
2006	58.393876
2007	59.407783
2008	60.319618
2009	60.994458
2010	61.88636
2011	62.554903
2012	62.513998
2013	63.203789
2014	64.158347
2015	64.313421
2016	65.207445
2017	65.478723
2018	66.334871
2019	66.531863
2020	65.243694
2021	63.108991
2022	64.354516