Year	% of cohort
1960	54.919698
1961	55.414744
1962	55.563511
1963	56.224539
1964	56.402627
1965	56.614317
1966	57.958859
1967	58.660912
1968	59.11374
1969	59.811138
1970	60.543183
1971	61.223836
1972	62.093481
1973	62.754028
1974	63.496635
1975	63.740692
1976	64.444003
1977	65.031022
1978	65.654118
1979	66.415747
1980	67.282971
1981	68.866432
1982	69.350808
1983	69.549391
1984	69.844842
1985	70.04726
1986	70.232967
1987	71.492057
1988	72.475624
1989	72.392042
1990	72.510388
1991	72.599045
1992	72.680387
1993	72.781917
1994	72.892806
1995	72.991815
1996	73.272757
1997	73.380778
1998	73.496303
1999	73.610142
2000	73.629297
2001	73.873112
2002	74.045928
2003	74.217495
2004	73.668829
2005	74.32196
2006	75.135776
2007	75.947768
2008	74.988569
2009	75.809666
2010	76.782576
2011	77.078281
2012	77.413382
2013	77.564052
2014	77.852705
2015	78.18072
2016	78.313225
2017	78.85099
2018	79.37593
2019	79.775203
2020	79.239306
2021	77.12472
2022	77.732104