Year	% of cohort
1960	65.054017
1961	64.920045
1962	64.873558
1963	65.636611
1964	66.004123
1965	66.526944
1966	67.206414
1967	67.39538
1968	67.466944
1969	67.836326
1970	68.36058
1971	68.690591
1972	69.23918
1973	69.742739
1974	70.334894
1975	70.667825
1976	69.879209
1977	70.378035
1978	70.639344
1979	71.017395
1980	71.457856
1981	72.091196
1982	72.509012
1983	72.406811
1984	71.965827
1985	72.270047
1986	72.535998
1987	73.342571
1988	73.937666
1989	73.66968
1990	73.365804
1991	72.883294
1992	72.418159
1993	73.449571
1994	73.254382
1995	73.076574
1996	73.116238
1997	73.141973
1998	73.358298
1999	73.573383
2000	73.894966
2001	74.266753
2002	73.282303
2003	74.018842
2004	74.600634
2005	75.277521
2006	76.021869
2007	75.543017
2008	76.676944
2009	77.01814
2010	78.007208
2011	78.837751
2012	79.753964
2013	80.355232
2014	81.164765
2015	81.824024
2016	81.200403
2017	82.374852
2018	82.399135
2019	82.859827
2020	80.36432
2021	78.941192
2022	78.791196