Year	% of cohort
1960	59.643427
1961	60.273487
1962	60.800032
1963	61.519622
1964	61.736499
1965	62.353819
1966	62.875636
1967	63.303966
1968	63.640295
1969	63.975046
1970	63.722797
1971	64.319243
1972	64.172176
1973	64.003189
1974	64.090023
1975	64.137221
1976	63.723221
1977	64.663893
1978	64.743323
1979	64.966155
1980	65.206315
1981	65.297736
1982	65.641646
1983	65.977435
1984	66.10355
1985	66.836791
1986	67.363342
1987	68.239833
1988	69.095883
1989	70.01099
1990	70.779772
1991	71.451283
1992	72.843287
1993	73.518955
1994	74.116378
1995	74.509124
1996	75.273307
1997	75.801514
1998	76.189403
1999	76.550367
2000	76.766444
2001	77.053881
2002	77.301276
2003	77.550902
2004	77.652726
2005	78.012388
2006	78.011784
2007	78.394007
2008	78.503959
2009	78.61155
2010	78.816998
2011	78.840455
2012	79.019902
2013	78.895931
2014	79.572748
2015	79.8374
2016	80.111334
2017	80.39666
2018	80.741955
2019	81.052182
2020	81.47604
2021	77.230674
2022	81.715031