Year	% of cohort
1960	58.41579
1961	58.296352
1962	58.661063
1963	58.472557
1964	59.482383
1965	59.664716
1966	51.92885
1967	59.260891
1968	58.981697
1969	59.21379
1970	59.463663
1971	60.443509
1972	60.744634
1973	61.142576
1974	61.82955
1975	61.812447
1976	62.217225
1977	62.601446
1978	63.066465
1979	63.217852
1980	63.373939
1981	63.852177
1982	63.856085
1983	64.187991
1984	64.854577
1985	65.4199
1986	65.826335
1987	67.342268
1988	66.318057
1989	65.751567
1990	65.303887
1991	67.587928
1992	67.749371
1993	68.072565
1994	68.281501
1995	68.930107
1996	68.883357
1997	69.509917
1998	69.603032
1999	69.518714
2000	69.448177
2001	68.902521
2002	69.684325
2003	69.482531
2004	71.651362
2005	72.145026
2006	72.468045
2007	72.616225
2008	72.392014
2009	69.878793
2010	72.213015
2011	72.292482
2012	72.528431
2013	72.319095
2014	72.619712
2015	72.946665
2016	72.234797
2017	72.355043
2018	72.356987
2019	71.791526
2020	72.321836
2021	70.447406
2022	72.375006