Year	% of cohort
1960	59.006689
1961	59.604489
1962	60.591255
1963	61.432372
1964	62.407102
1965	63.492965
1966	64.625058
1967	65.667953
1968	66.693006
1969	67.777535
1970	68.835431
1971	69.822107
1972	70.539563
1973	70.980993
1974	71.595703
1975	71.905648
1976	72.318511
1977	72.577351
1978	72.873104
1979	73.06025
1980	73.217126
1981	73.387435
1982	73.125616
1983	73.671809
1984	73.759281
1985	73.866822
1986	74.002938
1987	74.130927
1988	74.30719
1989	74.426574
1990	74.546446
1991	74.922892
1992	75.144281
1993	75.356846
1994	75.544469
1995	75.749123
1996	75.940287
1997	76.113723
1998	76.315091
1999	76.46306
2000	76.576446
2001	76.5795
2002	76.757391
2003	76.843231
2004	76.941772
2005	76.809032
2006	76.871064
2007	76.952059
2008	77.006569
2009	76.576023
2010	77.109353
2011	77.147768
2012	77.170847
2013	77.197623
2014	77.17982
2015	77.22917
2016	77.262326
2017	77.2695
2018	77.287036
2019	77.326593
2020	77.321973
2021	77.356139
2022	78.091906