Year	% of cohort
1960	60.447575
1961	61.266084
1962	62.004357
1963	63.329509
1964	63.754286
1965	64.935292
1966	66.226073
1967	66.083298
1968	66.493558
1969	65.960461
1970	66.623643
1971	66.213544
1972	67.6834
1973	68.115653
1974	69.153589
1975	69.154137
1976	69.470292
1977	68.977125
1978	68.401394
1979	67.311503
1980	68.607072
1981	67.944812
1982	67.355099
1983	66.744825
1984	69.549995
1985	71.909794
1986	72.675639
1987	74.136608
1988	74.4766
1989	73.434824
1990	71.959325
1991	70.998245
1992	70.236725
1993	70.854765
1994	71.04255
1995	71.02172
1996	70.818135
1997	70.328061
1998	69.502756
1999	69.827043
2000	72.889777
2001	73.500419
2002	72.715609
2003	73.166485
2004	73.54771
2005	73.148873
2006	73.319375
2007	74.242724
2008	75.152747
2009	75.534384
2010	76.896228
2011	76.373416
2012	78.141658
2013	77.820218
2014	77.883626
2015	78.268971
2016	78.28426
2017	78.250128
2018	78.970029
2019	78.324834
2020	76.961813
2021	76.740548
2022	77.665758