Year	% of cohort
1960	62.78657
1961	62.966522
1962	63.08899
1963	63.187195
1964	63.294453
1965	63.441833
1966	63.628823
1967	63.819616
1968	64.024786
1969	64.184915
1970	64.28858
1971	64.337496
1972	64.02239
1973	64.369611
1974	64.408616
1975	64.498727
1976	64.651413
1977	64.869086
1978	65.158681
1979	65.532445
1980	66.003163
1981	66.551354
1982	67.127527
1983	67.683139
1984	68.174327
1985	68.563011
1986	68.843628
1987	69.041703
1988	69.185767
1989	69.306486
1990	69.434926
1991	69.586428
1992	69.757708
1993	69.944117
1994	70.141792
1995	70.347858
1996	70.569623
1997	70.825211
1998	71.135834
1999	71.522547
2000	72.004614
2001	72.569199
2002	73.167079
2003	73.755684
2004	74.285693
2005	74.711762
2006	75.040844
2007	75.278182
2008	75.466266
2009	75.62511
2010	75.791095
2011	75.980253
2012	76.199706
2013	76.454616
2014	76.749115
2015	77.079425
2016	77.403554
2017	77.667025
2018	77.770208
2019	77.616203
2020	78.987008
2021	73.970714
2022	78.366944