Year	% of cohort
1960	30.543595
1961	30.96253
1962	31.406525
1963	32.029132
1964	32.422542
1965	33.060302
1966	33.766389
1967	34.300501
1968	35.061392
1969	35.202433
1970	35.667327
1971	36.316859
1972	37.165544
1973	37.88108
1974	38.596814
1975	39.76195
1976	41.188353
1977	42.628409
1978	44.406982
1979	45.323685
1980	46.25426
1981	46.967098
1982	47.907993
1983	49.125395
1984	50.111752
1985	50.864632
1986	51.993287
1987	53.001892
1988	53.558727
1989	54.176429
1990	55.139314
1991	55.63524
1992	56.126258
1993	56.239495
1994	56.304676
1995	56.213708
1996	55.919568
1997	56.675564
1998	57.319084
1999	57.731205
2000	57.681856
2001	57.330058
2002	56.474996
2003	56.591034
2004	56.199155
2005	56.896179
2006	57.37429
2007	57.400617
2008	57.842204
2009	57.825737
2010	58.396246
2011	58.347617
2012	58.299739
2013	59.003558
2014	58.970644
2015	59.638969
2016	59.611244
2017	60.372548
2018	60.534504
2019	61.360071
2020	60.365681
2021	60.019316
2022	60.391285