Year	% of cohort
1960	37.557749
1961	39.131377
1962	41.210573
1963	38.844222
1964	39.115243
1965	42.949037
1966	49.215113
1967	53.486949
1968	55.329003
1969	55.512054
1970	58.96418
1971	59.777811
1972	59.764252
1973	60.234475
1974	59.669789
1975	59.369136
1976	59.670505
1977	59.883352
1978	60.747781
1979	61.132548
1980	61.54183
1981	61.733296
1982	62.448058
1983	62.785569
1984	63.453333
1985	62.387093
1986	58.085463
1987	64.497966
1988	65.288169
1989	63.155436
1990	65.788077
1991	65.843877
1992	65.722004
1993	65.503697
1994	65.315432
1995	64.973345
1996	64.649193
1997	64.346406
1998	64.108049
1999	63.650596
2000	63.23511
2001	63.431124
2002	64.410054
2003	65.32286
2004	66.812659
2005	66.89401
2006	68.061852
2007	67.820983
2008	68.551744
2009	68.726851
2010	68.466905
2011	66.886036
2012	69.495075
2013	70.102784
2014	71.681971
2015	71.945159
2016	72.124049
2017	73.993766
2018	73.91515
2019	74.08204
2020	72.667195
2021	71.685682
2022	74.624044