Year	% of cohort
1960	27.557931
1961	27.963728
1962	28.072735
1963	28.359163
1964	28.376395
1965	28.395382
1966	28.561895
1967	28.592881
1968	28.487481
1969	28.24395
1970	27.897554
1971	26.783463
1972	27.450166
1973	28.072485
1974	28.982564
1975	30.566381
1976	30.82771
1977	31.853745
1978	32.92066
1979	34.080915
1980	34.484985
1981	35.114558
1982	35.308545
1983	35.489392
1984	35.005775
1985	35.184122
1986	35.510689
1987	36.334112
1988	36.969905
1989	37.756877
1990	38.820448
1991	39.333822
1992	40.351535
1993	41.529722
1994	42.6838
1995	43.706504
1996	44.703493
1997	45.594039
1998	46.425087
1999	46.766258
2000	47.23797
2001	47.623604
2002	48.366178
2003	49.054983
2004	51.05259
2005	52.393637
2006	53.825766
2007	55.209582
2008	56.557336
2009	57.770788
2010	59.292637
2011	60.133513
2012	60.867231
2013	61.905997
2014	62.799941
2015	63.62601
2016	64.401751
2017	65.274997
2018	65.37633
2019	66.459091
2020	62.702188
2021	63.096146
2022	64.085658