Year	% of cohort
1960	52.421418
1961	53.238014
1962	54.023028
1963	54.743343
1964	55.33128
1965	55.757283
1966	56.012164
1967	56.266491
1968	56.576817
1969	56.779431
1970	57.676773
1971	58.645351
1972	59.84324
1973	61.185482
1974	62.652509
1975	64.131153
1976	65.516464
1977	66.909747
1978	68.130648
1979	69.214974
1980	70.154759
1981	70.969319
1982	71.649033
1983	72.158429
1984	72.908403
1985	73.491302
1986	74.077874
1987	74.667741
1988	75.237965
1989	75.787035
1990	76.334921
1991	76.540234
1992	77.269858
1993	77.612576
1994	78.373875
1995	78.864876
1996	79.357266
1997	79.821629
1998	80.304741
1999	80.860832
2000	81.338984
2001	81.861807
2002	82.330783
2003	82.795464
2004	83.17353
2005	83.467799
2006	83.686994
2007	83.884168
2008	84.062223
2009	84.318049
2010	84.633764
2011	85.037863
2012	85.456089
2013	85.860366
2014	86.19731
2015	86.410568
2016	86.28358
2017	86.586056
2018	86.678783
2019	86.856651
2020	81.291034
2021	82.990239
2022	87.779285