Year	% of cohort
1960	50.956828
1961	52.607515
1962	54.164759
1963	55.822128
1964	57.480844
1965	58.794082
1966	59.996434
1967	61.428814
1968	62.713662
1969	64.072628
1970	65.368712
1971	66.405203
1972	67.473724
1973	68.607315
1974	69.530519
1975	70.297534
1976	70.845398
1977	71.449863
1978	71.623892
1979	72.01422
1980	73.093043
1981	73.319814
1982	73.571564
1983	73.886788
1984	74.139199
1985	74.340631
1986	74.793596
1987	75.349705
1988	75.590302
1989	75.897293
1990	76.175504
1991	76.577812
1992	77.092514
1993	77.544962
1994	77.911718
1995	78.26795
1996	78.641264
1997	76.768631
1998	79.451654
1999	79.768604
2000	80.135436
2001	80.533022
2002	80.955791
2003	81.334282
2004	81.710231
2005	82.009211
2006	82.2343
2007	83.361624
2008	83.333917
2009	83.416926
2010	83.528756
2011	83.691074
2012	83.652918
2013	83.707429
2014	84.249494
2015	84.678267
2016	85.052413
2017	85.44531
2018	85.765544
2019	86.047386
2020	81.703058
2021	80.5539
2022	81.240663