Year	% of cohort
1960	46.60606
1961	47.414972
1962	47.642158
1963	48.96007
1964	49.66879
1965	50.206003
1966	50.890814
1967	51.478104
1968	52.010134
1969	52.465034
1970	39.142463
1971	53.105809
1972	53.614472
1973	53.777931
1974	54.061627
1975	54.427474
1976	54.725726
1977	55.003745
1978	55.259758
1979	55.4171
1980	55.426847
1981	55.3264
1982	54.940296
1983	54.327558
1984	54.061299
1985	55.718382
1986	56.885409
1987	58.112664
1988	59.346297
1989	60.362834
1990	61.62778
1991	62.002576
1992	62.89873
1993	63.703745
1994	64.599793
1995	65.138271
1996	65.990177
1997	66.808538
1998	67.718898
1999	68.97971
2000	70.299693
2001	71.590191
2002	72.86296
2003	73.960559
2004	74.792256
2005	75.29637
2006	75.477135
2007	75.36832
2008	75.420343
2009	75.30291
2010	75.621652
2011	76.417042
2012	77.141121
2013	77.870749
2014	78.463741
2015	78.813864
2016	78.909991
2017	78.907559
2018	79.093208
2019	79.538742
2020	71.673491
2021	69.475496
2022	72.66549