Year	% of cohort
1960	63.756559
1961	63.973619
1962	64.864401
1963	64.802517
1964	65.967625
1965	66.540072
1966	67.12858
1967	67.738342
1968	68.367583
1969	69.023622
1970	69.709275
1971	70.436486
1972	71.159686
1973	71.855384
1974	72.490122
1975	73.025665
1976	73.44535
1977	73.755245
1978	73.985753
1979	74.157447
1980	74.384786
1981	74.527527
1982	74.666147
1983	74.743696
1984	74.792429
1985	74.754994
1986	74.644586
1987	74.500517
1988	74.363125
1989	74.279587
1990	74.297214
1991	74.431261
1992	74.652974
1993	74.942236
1994	75.270025
1995	75.611351
1996	75.957209
1997	76.311259
1998	76.681335
1999	77.078197
2000	77.504206
2001	77.954176
2002	78.404138
2003	78.826669
2004	79.199035
2005	79.505331
2006	79.736913
2007	79.905759
2008	80.027126
2009	80.111883
2010	80.175215
2011	80.218669
2012	80.224356
2013	80.177105
2014	80.06271
2015	79.868135
2016	79.604118
2017	79.338827
2018	79.149882
2019	79.108991
2020	79.063669
2021	72.85917
2022	80.287386