Year	% of cohort
1960	57.729414
1961	58.770002
1962	59.518074
1963	60.054348
1964	60.458405
1965	60.81738
1966	61.119843
1967	61.549209
1968	61.967268
1969	62.450025
1970	62.894308
1971	63.629499
1972	64.23612
1973	64.770563
1974	65.252352
1975	65.609497
1976	65.88198
1977	66.131166
1978	66.382966
1979	66.845395
1980	67.47448
1981	68.28646
1982	69.155779
1983	69.961803
1984	70.593559
1985	70.960282
1986	71.050687
1987	70.971675
1988	70.770995
1989	67.548744
1990	70.680142
1991	70.731698
1992	71.058776
1993	71.535485
1994	71.935058
1995	72.295085
1996	72.628279
1997	72.960996
1998	73.333406
1999	73.794939
2000	74.378342
2001	75.063497
2002	75.744809
2003	76.356421
2004	76.778489
2005	77.008512
2006	76.967692
2007	76.808676
2008	76.560352
2009	76.47158
2010	76.529579
2011	76.875872
2012	77.34627
2013	77.883389
2014	78.357087
2015	78.727063
2016	78.887177
2017	78.813387
2018	78.445239
2019	77.675039
2020	76.593285
2021	76.058511
2022	77.087017