Year	% of cohort
1960	56.835441
1961	57.903649
1962	59.000467
1963	51.340634
1964	52.176164
1965	62.099409
1966	62.973128
1967	63.503779
1968	64.417502
1969	64.675403
1970	65.458913
1971	66.293342
1972	66.935005
1973	67.836786
1974	24.415571
1975	68.355165
1976	69.470388
1977	69.817979
1978	70.876934
1979	71.315725
1980	71.465596
1981	71.65267
1982	71.686742
1983	72.845207
1984	72.69107
1985	73.331331
1986	73.819431
1987	74.369328
1988	74.453133
1989	75.29554
1990	75.895006
1991	76.430381
1992	76.986362
1993	77.678484
1994	78.237111
1995	78.626382
1996	79.278262
1997	79.728679
1998	80.14324
1999	80.581052
2000	81.154394
2001	81.758371
2002	82.370753
2003	82.749247
2004	83.031342
2005	83.222959
2006	83.647427
2007	84.202096
2008	84.405751
2009	84.797358
2010	85.125657
2011	85.613862
2012	86.075269
2013	86.493235
2014	87.037057
2015	87.421142
2016	87.392238
2017	87.834912
2018	88.397357
2019	88.291142
2020	87.892866
2021	88.341626
2022	88.822667