Year	% of cohort
1960	28.000811
1961	28.377945
1962	28.803748
1963	29.097062
1964	29.682083
1965	30.060736
1966	30.50671
1967	30.944342
1968	31.397036
1969	31.945633
1970	32.278897
1971	32.610223
1972	33.358052
1973	33.755707
1974	34.300758
1975	34.892299
1976	35.934818
1977	36.51692
1978	37.113134
1979	37.208239
1980	37.722025
1981	38.15754
1982	38.651127
1983	38.960306
1984	39.152444
1985	40.303321
1986	41.361018
1987	42.111408
1988	43.455558
1989	43.894677
1990	44.768116
1991	45.093567
1992	45.854604
1993	46.945355
1994	47.854505
1995	48.964359
1996	49.868382
1997	50.310423
1998	50.195493
1999	50.585466
2000	50.441882
2001	50.718932
2002	50.972061
2003	50.979448
2004	51.353299
2005	51.467468
2006	51.947059
2007	52.449635
2008	52.456345
2009	52.527999
2010	53.25891
2011	53.402058
2012	54.163365
2013	54.154858
2014	54.552444
2015	54.588254
2016	54.983316
2017	55.17294
2018	55.830973
2019	55.934755
2020	54.645469
2021	53.346483
2022	53.415754