Year	% of cohort
1960	64.733748
1961	64.71397
1962	64.381426
1963	65.543772
1964	66.232077
1965	67.164243
1966	67.405644
1967	66.735007
1968	67.295107
1969	66.184903
1970	66.282601
1971	65.42411
1972	67.484257
1973	67.077929
1974	67.888392
1975	66.375954
1976	65.398714
1977	64.774259
1978	64.320793
1979	64.611496
1980	62.933485
1981	64.831612
1982	65.069782
1983	64.215302
1984	63.193402
1985	62.524905
1986	62.611504
1987	62.630603
1988	63.075255
1989	62.173803
1990	61.581121
1991	60.26029
1992	61.541574
1993	63.287998
1994	63.968236
1995	63.797359
1996	64.929038
1997	65.292061
1998	65.915059
1999	65.894272
2000	67.889292
2001	69.016487
2002	69.64668
2003	70.115442
2004	69.947996
2005	70.136251
2006	70.1116
2007	70.097511
2008	70.689446
2009	71.384111
2010	72.433881
2011	73.004669
2012	73.20644
2013	74.042814
2014	75.398956
2015	75.115904
2016	75.623215
2017	75.859523
2018	75.751027
2019	76.207624
2020	75.895016
2021	76.127479
2022	76.620058