Year	% of cohort
1960	61.194236
1961	61.567692
1962	62.124225
1963	62.765178
1964	63.489943
1965	63.623267
1966	64.114939
1967	64.752442
1968	65.382094
1969	66.43714
1970	66.554512
1971	67.196043
1972	67.677106
1973	67.354733
1974	68.080298
1975	68.182941
1976	69.053975
1977	68.740007
1978	69.091401
1979	69.31797
1980	69.545732
1981	69.872895
1982	70.111338
1983	70.377834
1984	70.639316
1985	71.019209
1986	71.452997
1987	71.811143
1988	71.973095
1989	72.113336
1990	72.047163
1991	71.670657
1992	71.534515
1993	70.967597
1994	70.743613
1995	70.840295
1996	70.928301
1997	71.027993
1998	71.397983
1999	71.906708
2000	72.37636
2001	72.915252
2002	73.667512
2003	74.399689
2004	75.160008
2005	74.600018
2006	74.997847
2007	75.678813
2008	76.287857
2009	76.389914
2010	76.721118
2011	77.39497
2012	77.818797
2013	78.515899
2014	79.120028
2015	79.523717
2016	79.912939
2017	80.423386
2018	80.553624
2019	80.699872
2020	78.797421
2021	79.759392
2022	81.287468