Year	% of cohort
1960	45.728435
1961	46.263363
1962	46.649358
1963	47.147615
1964	46.853689
1965	47.89558
1966	47.995804
1967	48.236123
1968	48.189458
1969	48.702737
1970	49.055826
1971	49.85651
1972	50.631237
1973	51.494735
1974	52.332467
1975	52.986638
1976	53.908063
1977	54.42708
1978	54.298286
1979	53.994443
1980	53.604058
1981	53.561566
1982	53.511866
1983	52.3344
1984	51.253184
1985	49.332544
1986	47.592569
1987	46.217596
1988	44.255003
1989	42.413979
1990	40.313683
1991	38.364644
1992	36.786818
1993	35.936422
1994	34.280562
1995	33.42108
1996	32.382
1997	31.230297
1998	30.052192
1999	29.376114
2000	30.359877
2001	31.175426
2002	31.685862
2003	33.814219
2004	34.943917
2005	36.744752
2006	38.741674
2007	40.60163
2008	43.403826
2009	45.999472
2010	50.082211
2011	52.415273
2012	55.168559
2013	57.172413
2014	59.350771
2015	61.087586
2016	62.355434
2017	63.538476
2018	64.420318
2019	65.551864
2020	64.511353
2021	61.534912
2022	62.604672