Year	% of cohort
1960	68.796216
1961	69.164412
1962	70.123949
1963	70.732183
1964	70.823154
1965	71.412428
1966	72.643842
1967	72.288399
1968	72.881308
1969	73.039858
1970	73.802704
1971	74.547757
1972	75.611244
1973	75.92738
1974	76.814067
1975	77.076297
1976	77.375948
1977	77.956221
1978	77.930117
1979	77.900135
1980	78.267748
1981	78.254354
1982	78.217682
1983	77.589253
1984	77.73861
1985	78.413259
1986	78.521375
1987	78.743857
1988	79.33323
1989	79.682859
1990	80.411591
1991	80.956836
1992	81.252846
1993	81.384876
1994	81.749546
1995	82.308619
1996	81.994867
1997	82.112889
1998	81.51098
1999	78.773033
2000	81.649692
2001	82.851331
2002	82.727564
2003	82.977659
2004	83.303763
2005	83.387964
2006	84.344791
2007	84.734844
2008	85.094085
2009	85.37189
2010	85.827866
2011	86.328652
2012	86.802535
2013	87.571308
2014	87.763804
2015	87.924971
2016	88.589976
2017	88.509813
2018	88.958236
2019	89.436199
2020	88.842235
2021	87.581267
2022	87.328962