Year	% of cohort
1960	51.41411
1961	52.55874
1962	53.398183
1963	54.560227
1964	55.327896
1965	56.165944
1966	56.77827
1967	58.104237
1968	59.017624
1969	59.813356
1970	60.765616
1971	62.558777
1972	63.25605
1973	63.699734
1974	64.96295
1975	65.146639
1976	65.912428
1977	65.071691
1978	70.160779
1979	70.972834
1980	71.806518
1981	69.56786
1982	66.909106
1983	74.187793
1984	76.256556
1985	75.367425
1986	76.250585
1987	76.540755
1988	77.33597
1989	77.492941
1990	77.659103
1991	78.484667
1992	78.595731
1993	78.430556
1994	78.232456
1995	78.768045
1996	78.541075
1997	78.326197
1998	78.045224
1999	78.90863
2000	79.706575
2001	81.306563
2002	81.934412
2003	83.000586
2004	82.587098
2005	83.221758
2006	84.572902
2007	85.38605
2008	85.021769
2009	85.599246
2010	85.620274
2011	85.094722
2012	77.74533
2013	74.380524
2014	73.004678
2015	75.34749
2016	76.442628
2017	82.55943
2018	83.091188
2019	83.953894
2020	83.808298
2021	83.357266
2022	84.601201