Year	% of cohort
1960	40.176998
1961	40.904716
1962	41.62168
1963	41.234381
1964	42.869462
1965	44.314475
1966	46.170844
1967	49.205056
1968	48.801755
1969	49.353944
1970	49.244816
1971	50.00591
1972	50.375845
1973	50.949305
1974	51.432161
1975	51.90935
1976	52.35544
1977	50.986022
1978	51.699157
1979	54.154652
1980	51.905504
1981	56.615255
1982	56.218948
1983	55.281237
1984	58.308825
1985	58.37623
1986	59.505447
1987	59.993237
1988	61.719665
1989	62.732102
1990	65.77037
1991	66.757305
1992	67.863732
1993	68.809347
1994	69.502011
1995	70.288328
1996	71.05012
1997	72.589309
1998	73.682185
1999	74.943595
2000	75.931812
2001	77.435602
2002	78.250043
2003	78.408708
2004	79.264023
2005	80.345323
2006	81.292699
2007	82.081442
2008	82.822749
2009	83.650793
2010	83.919409
2011	84.62503
2012	84.895478
2013	85.807254
2014	86.772602
2015	87.4848
2016	88.272709
2017	89.001467
2018	89.349427
2019	89.951707
2020	88.866221
2021	89.327938
2022	89.913902