Year	% of cohort
1960	52.880361
1961	54.024902
1962	55.036752
1963	56.374835
1964	57.289689
1965	58.080873
1966	59.123118
1967	59.872915
1968	60.730714
1969	61.741835
1970	62.733461
1971	63.800045
1972	64.973502
1973	66.077719
1974	67.144285
1975	68.150611
1976	69.078235
1977	69.98899
1978	70.782795
1979	71.534546
1980	72.417997
1981	73.006824
1982	73.703763
1983	74.234291
1984	74.829306
1985	75.405247
1986	76.028158
1987	76.389566
1988	76.977416
1989	77.564337
1990	78.173192
1991	78.729782
1992	79.328932
1993	79.897155
1994	80.424988
1995	80.961594
1996	81.467623
1997	81.92247
1998	82.337394
1999	82.728234
2000	83.066206
2001	83.338369
2002	83.568367
2003	83.730528
2004	83.855596
2005	83.937554
2006	83.996748
2007	84.035459
2008	84.061926
2009	84.091018
2010	84.111224
2011	84.128021
2012	84.127532
2013	84.119015
2014	84.139231
2015	84.132643
2016	84.155762
2017	84.196093
2018	84.255029
2019	84.3614
2020	84.489158
2021	84.598772
2022	84.481022