Year	% of cohort
1960	35.394836
1961	35.666778
1962	35.807356
1963	36.230212
1964	36.484879
1965	37.14775
1966	37.87321
1967	38.792152
1968	40.336068
1969	41.796506
1970	42.851535
1971	43.552639
1972	43.838954
1973	45.350281
1974	45.754483
1975	46.168464
1976	46.880531
1977	47.916344
1978	48.717944
1979	49.792132
1980	50.557883
1981	51.323329
1982	51.388
1983	51.563562
1984	51.805351
1985	51.580242
1986	51.463635
1987	51.17937
1988	50.786849
1989	50.212102
1990	48.649572
1991	48.141118
1992	47.174998
1993	46.072406
1994	45.772867
1995	44.84782
1996	43.931877
1997	42.450241
1998	41.960026
1999	43.495464
2000	43.748244
2001	44.804628
2002	45.502703
2003	46.849065
2004	47.633668
2005	48.462385
2006	49.586756
2007	50.546264
2008	51.309934
2009	52.588748
2010	56.187709
2011	58.519011
2012	60.851654
2013	63.153685
2014	65.101076
2015	66.679628
2016	67.95932
2017	68.90363
2018	69.614883
2019	70.552882
2020	69.406937
2021	68.842383
2022	69.87761