Year	% of cohort
1960	80.472175
1961	81.419715
1962	80.948299
1963	80.474055
1964	80.11289
1965	80.507667
1966	80.425246
1967	80.685114
1968	80.578092
1969	81.075215
1970	80.3624
1971	81.616018
1972	81.99658
1973	82.588481
1974	82.255158
1975	83.292995
1976	83.655312
1977	84.159451
1978	84.478098
1979	85.584516
1980	86.10466
1981	86.333668
1982	86.155059
1983	86.571285
1984	86.884033
1985	86.933861
1986	87.696392
1987	87.733404
1988	87.991309
1989	88.013543
1990	88.811695
1991	89.054016
1992	89.15465
1993	89.688288
1994	89.707133
1995	89.941497
1996	90.011658
1997	90.194604
1998	90.552245
1999	90.820878
2000	91.023514
2001	91.378199
2002	91.232211
2003	91.61973
2004	91.892235
2005	92.088322
2006	92.172933
2007	92.110197
2008	92.441427
2009	92.411787
2010	92.721864
2011	92.698684
2012	92.875853
2013	92.829495
2014	92.836883
2015	92.947333
2016	93.074736
2017	93.192146
2018	93.234961
2019	92.968392
2020	94.398383
2021	94.804253
2022	93.468752