Year	% of cohort
1960	45.280438
1961	46.440516
1962	47.20773
1963	47.921641
1964	48.533991
1965	49.013583
1966	49.435045
1967	49.829654
1968	50.433203
1969	50.864691
1970	51.531757
1971	53.319829
1972	54.979498
1973	55.627012
1974	54.556589
1975	53.740393
1976	53.931858
1977	55.320314
1978	56.148288
1979	57.047635
1980	58.099369
1981	65.283014
1982	63.936276
1983	63.224017
1984	62.361836
1985	61.577486
1986	60.065167
1987	59.607939
1988	58.651195
1989	57.54314
1990	57.166101
1991	56.190571
1992	55.055436
1993	53.425847
1994	52.511024
1995	50.527165
1996	49.256408
1997	47.996131
1998	46.591383
1999	45.689694
2000	44.310595
2001	43.794369
2002	44.415641
2003	45.241931
2004	46.397309
2005	48.370465
2006	50.325806
2007	51.223204
2008	53.006846
2009	54.643462
2010	54.804166
2011	55.952701
2012	55.792369
2013	55.769207
2014	57.496412
2015	57.697924
2016	57.632708
2017	59.262904
2018	59.527872
2019	59.627453
2020	59.014373
2021	57.175653
2022	58.286694