Year	% of cohort
1960	63.763318
1961	64.605857
1962	64.250702
1963	63.734076
1964	63.900074
1965	63.874156
1966	63.632838
1967	64.072047
1968	63.332195
1969	63.841303
1970	64.231803
1971	65.02277
1972	65.030676
1973	65.577269
1974	66.741128
1975	67.737085
1976	68.440906
1977	69.112768
1978	69.564958
1979	70.34525
1980	70.519523
1981	71.223979
1982	72.030283
1983	72.440896
1984	72.67514
1985	72.706468
1986	72.91003
1987	73.17942
1988	73.257736
1989	73.632331
1990	74.106984
1991	74.414147
1992	74.883314
1993	74.731364
1994	74.984171
1995	75.346237
1996	76.294626
1997	77.361726
1998	77.888799
1999	78.132135
2000	78.377807
2001	78.507907
2002	78.537802
2003	78.674616
2004	79.213754
2005	79.110897
2006	79.406502
2007	79.752684
2008	79.962585
2009	80.290213
2010	80.706209
2011	80.710977
2012	80.725484
2013	80.664948
2014	80.550424
2015	80.251341
2016	79.848681
2017	79.779206
2018	79.931689
2019	79.977234
2020	77.113673
2021	75.383496
2022	77.585606