Year	% of cohort
1960	56.772904
1961	57.917787
1962	59.02855
1963	59.879128
1964	59.975974
1965	61.081022
1966	61.240716
1967	62.327384
1968	62.383496
1969	63.301766
1970	64.298756
1971	65.286841
1972	65.483558
1973	66.404774
1974	67.39017
1975	68.137397
1976	68.853224
1977	69.700596
1978	70.498164
1979	70.726636
1980	71.534485
1981	71.826602
1982	72.821998
1983	73.274506
1984	74.416147
1985	74.502597
1986	74.860387
1987	74.912325
1988	76.065234
1989	76.426485
1990	76.761401
1991	77.022834
1992	77.725789
1993	77.89118
1994	77.976061
1995	78.8321
1996	78.887493
1997	79.799612
1998	79.987597
1999	80.201915
2000	80.176698
2001	81.280361
2002	78.782601
2003	81.645449
2004	81.72453
2005	81.901583
2006	82.000283
2007	82.024882
2008	82.654082
2009	82.62092
2010	82.862536
2011	83.058788
2012	83.201215
2013	83.286841
2014	83.388492
2015	83.114864
2016	83.359463
2017	83.213123
2018	83.050324
2019	82.680314
2020	81.893959
2021	81.898898
2022	82.223286