Year	% of cohort
1960	61.658004
1961	61.643866
1962	62.36587
1963	62.483699
1964	62.738499
1965	63.312805
1966	63.572206
1967	64.420688
1968	64.634066
1969	64.74508
1970	65.594281
1971	65.81878
1972	65.903124
1973	67.140984
1974	67.240303
1975	67.365388
1976	68.54758
1977	68.736357
1978	68.902515
1979	69.769876
1980	70.016198
1981	70.228616
1982	70.452231
1983	70.621556
1984	70.631984
1985	71.747573
1986	71.872271
1987	72.01052
1988	72.112624
1989	72.067292
1990	72.436988
1991	72.563037
1992	72.685446
1993	72.817341
1994	72.896013
1995	72.942809
1996	73.063775
1997	73.143154
1998	73.263589
1999	73.435535
2000	73.601809
2001	73.614576
2002	73.762611
2003	74.012547
2004	74.005457
2005	74.24876
2006	74.228056
2007	74.461161
2008	74.543273
2009	74.840566
2010	75.581107
2011	76.07072
2012	76.867435
2013	77.168074
2014	76.783376
2015	76.846402
2016	76.35579
2017	76.978445
2018	76.962292
2019	76.947254
2020	76.863034
2021	75.692612
2022	77.902969