Year	% of cohort
1960	65.307682
1961	65.546582
1962	65.468702
1963	65.631322
1964	65.835833
1965	66.156091
1966	66.481187
1967	66.951363
1968	67.275855
1969	67.52182
1970	67.362066
1971	67.327205
1972	67.031212
1973	67.195041
1974	67.259946
1975	67.940208
1976	68.49723
1977	69.133957
1978	69.237136
1979	69.539464
1980	69.746285
1981	70.004746
1982	70.275109
1983	70.131222
1984	70.131911
1985	69.291819
1986	70.154498
1987	70.06166
1988	70.021761
1989	69.97066
1990	70.000783
1991	69.978157
1992	69.966233
1993	69.321284
1994	69.371761
1995	69.923112
1996	70.308325
1997	70.932765
1998	71.416815
1999	71.96075
2000	72.677068
2001	73.398619
2002	73.765182
2003	73.910506
2004	74.182013
2005	74.173274
2006	74.39915
2007	74.530039
2008	74.79185
2009	74.753729
2010	74.912025
2011	75.377776
2012	75.629053
2013	76.214357
2014	76.557991
2015	77.75933
2016	78.656334
2017	77.894267
2018	78.088918
2019	77.394538
2020	75.615779
2021	78.207448
2022	77.63825