Year	% of cohort
1960	40.858778
1961	41.036203
1962	41.520984
1963	41.976422
1964	42.084841
1965	42.469283
1966	43.041691
1967	43.250126
1968	43.806067
1969	44.178084
1970	44.564822
1971	45.188737
1972	45.769632
1973	46.336029
1974	46.824683
1975	47.449862
1976	47.891797
1977	48.427927
1978	48.796809
1979	49.308522
1980	49.987112
1981	50.405248
1982	50.91031
1983	51.32072
1984	51.952012
1985	52.589782
1986	53.1319
1987	54.062159
1988	55.038024
1989	56.067706
1990	57.061672
1991	58.16412
1992	58.739841
1993	60.300872
1994	61.245198
1995	62.016121
1996	62.828786
1997	63.743989
1998	64.764144
1999	65.766311
2000	66.48655
2001	67.408164
2002	68.307921
2003	68.910645
2004	69.164547
2005	69.808714
2006	70.49236
2007	70.762645
2008	71.603263
2009	72.43321
2010	72.890223
2011	73.532813
2012	73.780103
2013	74.381868
2014	74.453173
2015	74.616751
2016	75.260692
2017	75.356707
2018	75.3157
2019	75.399509
2020	68.860077
2021	66.245486
2022	69.067848