Year	% of cohort
1960	57.034163
1961	57.741279
1962	57.176366
1963	57.461645
1964	57.025477
1965	57.437747
1966	58.026567
1967	57.878336
1968	57.170689
1969	56.768777
1970	58.324605
1971	58.197
1972	58.736508
1973	59.294586
1974	59.356658
1975	60.236503
1976	60.2162
1977	61.295944
1978	62.114182
1979	62.594198
1980	62.633408
1981	63.056755
1982	62.789635
1983	63.561539
1984	63.214879
1985	64.641632
1986	65.632227
1987	66.57694
1988	67.642546
1989	68.320749
1990	69.158979
1991	69.875234
1992	70.070412
1993	70.132455
1994	72.025781
1995	71.554801
1996	71.845695
1997	71.008322
1998	71.828462
1999	72.273863
2000	72.570527
2001	72.83991
2002	72.813219
2003	72.931453
2004	74.178875
2005	74.448597
2006	75.089476
2007	74.045151
2008	75.426685
2009	76.122828
2010	75.807744
2011	76.340207
2012	76.49646
2013	76.625409
2014	77.340021
2015	77.188329
2016	76.650249
2017	77.726762
2018	77.969309
2019	78.412194
2020	76.217396
2021	76.225132
2022	77.204765