Year	% of cohort
1960	43.310253
1961	44.39734
1962	45.337089
1963	46.036124
1964	46.957564
1965	47.702492
1966	48.4381
1967	49.140289
1968	49.934259
1969	50.571561
1970	51.271326
1971	52.372354
1972	53.261157
1973	54.307446
1974	55.340704
1975	56.884542
1976	57.735708
1977	59.005535
1978	60.299463
1979	61.160232
1980	61.789622
1981	62.498765
1982	63.371581
1983	63.386445
1984	63.886071
1985	64.349896
1986	64.81376
1987	65.525849
1988	65.057122
1989	66.660079
1990	65.694697
1991	63.989569
1992	61.923727
1993	59.760033
1994	57.128077
1995	54.193223
1996	49.778108
1997	46.813827
1998	42.934533
1999	40.727684
2000	38.004066
2001	35.977104
2002	35.772881
2003	35.093224
2004	35.795838
2005	36.61218
2006	38.588206
2007	40.947224
2008	42.969917
2009	44.671248
2010	45.174484
2011	46.884052
2012	49.749111
2013	52.233438
2014	54.375083
2015	56.545113
2016	59.086184
2017	60.469401
2018	61.006265
2019	61.830251
2020	62.071638
2021	55.067153
2022	52.423459