Year	% of cohort
1960	46.729431
1961	48.094589
1962	48.894085
1963	49.657213
1964	50.995114
1965	51.852914
1966	52.415973
1967	52.395744
1968	54.570979
1969	56.316445
1970	57.239403
1971	58.224485
1972	59.044719
1973	53.434011
1974	61.153815
1975	62.089708
1976	62.348305
1977	61.813124
1978	65.059584
1979	65.134102
1980	64.691045
1981	59.337805
1982	50.452371
1983	67.225795
1984	69.503113
1985	69.26549
1986	70.003039
1987	69.814753
1988	70.423863
1989	70.379497
1990	70.248553
1991	70.150387
1992	70.787408
1993	70.408577
1994	70.138544
1995	70.555541
1996	70.240074
1997	69.94913
1998	69.640635
1999	69.617932
2000	70.102346
2001	72.053209
2002	72.519394
2003	73.262659
2004	73.862954
2005	74.367566
2006	75.149299
2007	75.628386
2008	75.380292
2009	75.861517
2010	75.917803
2011	74.314108
2012	58.60225
2013	51.83107
2014	50.737747
2015	55.115827
2016	57.032378
2017	58.873241
2018	64.315206
2019	69.617048
2020	71.033024
2021	71.417733
2022	70.370389