Year	% of cohort
1960	33.886907
1961	36.534057
1962	38.976027
1963	40.925061
1964	42.6344
1965	43.383038
1966	42.816272
1967	41.5041
1968	43.118261
1969	45.267357
1970	46.845432
1971	46.767283
1972	46.401462
1973	47.896116
1974	46.838928
1975	47.420729
1976	46.909683
1977	49.549852
1978	51.434532
1979	53.230587
1980	54.926647
1981	57.326702
1982	58.563989
1983	58.705103
1984	58.406632
1985	58.558451
1986	59.173433
1987	59.909094
1988	59.856499
1989	60.958491
1990	62.175513
1991	64.120391
1992	64.647678
1993	64.592351
1994	64.600856
1995	64.894995
1996	64.440759
1997	64.975495
1998	65.265965
1999	66.620684
2000	67.071131
2001	67.494536
2002	67.52508
2003	67.905937
2004	68.137616
2005	68.280883
2006	68.443364
2007	68.327146
2008	68.62617
2009	69.142097
2010	70.074626
2011	70.651477
2012	71.101574
2013	71.634531
2014	71.878607
2015	72.168732
2016	72.238969
2017	72.207022
2018	72.606375
2019	73.057055
2020	71.192279
2021	70.918184
2022	71.550843