Year	% of cohort
1960	39.757105
1961	40.176002
1962	40.563846
1963	40.981833
1964	41.421297
1965	41.7147
1966	42.190274
1967	42.829367
1968	43.373271
1969	43.788848
1970	44.181485
1971	44.969522
1972	45.323765
1973	45.948351
1974	46.465303
1975	47.174238
1976	47.748537
1977	48.316433
1978	48.75977
1979	49.551732
1980	49.562666
1981	50.07811
1982	50.947742
1983	51.236156
1984	51.387247
1985	52.281848
1986	53.071438
1987	53.610659
1988	53.718881
1989	54.170302
1990	53.570147
1991	52.947615
1992	52.087993
1993	51.467179
1994	50.9157
1995	50.887179
1996	51.22609
1997	52.013889
1998	53.010343
1999	53.888983
2000	53.713536
2001	54.152811
2002	53.606364
2003	54.16719
2004	54.75929
2005	54.684068
2006	55.335888
2007	56.27339
2008	56.231979
2009	57.262469
2010	58.349057
2011	58.645154
2012	59.675585
2013	60.457804
2014	61.813914
2015	62.890427
2016	62.595492
2017	63.458192
2018	63.368748
2019	64.056602
2020	60.263851
2021	60.539918
2022	61.427134