Year	% of cohort
1960	51.631277
1961	53.081095
1962	54.751027
1963	56.768013
1964	57.452125
1965	56.477267
1966	56.739204
1967	56.166587
1968	58.00061
1969	58.588025
1970	59.208378
1971	59.796455
1972	60.438245
1973	61.31656
1974	62.051009
1975	62.876982
1976	62.918891
1977	61.704557
1978	62.029856
1979	62.445369
1980	62.778554
1981	63.070807
1982	63.560343
1983	47.874759
1984	64.534136
1985	65.000579
1986	65.06342
1987	65.671256
1988	66.047909
1989	66.547779
1990	67.031787
1991	67.579598
1992	68.26025
1993	68.816729
1994	69.118361
1995	69.608528
1996	70.047825
1997	70.524385
1998	70.940312
1999	71.302081
2000	71.403283
2001	72.022885
2002	72.036912
2003	71.442296
2004	69.474297
2005	71.294699
2006	71.439898
2007	72.495052
2008	73.533595
2009	73.949494
2010	74.014504
2011	74.207251
2012	73.500155
2013	73.621457
2014	73.083275
2015	73.119355
2016	72.696478
2017	72.871653
2018	73.113165
2019	73.423652
2020	73.809065
2021	74.282637
2022	73.974195