Year	% of cohort
1960	32.995412
1961	34.381185
1962	35.509861
1963	36.245574
1964	36.843788
1965	37.041711
1966	36.912966
1967	37.934916
1968	38.141239
1969	38.475643
1970	38.492733
1971	32.464617
1972	32.586308
1973	33.710763
1974	32.330457
1975	33.099735
1976	32.679092
1977	32.246347
1978	30.654029
1979	30.481335
1980	26.130999
1981	26.304441
1982	24.715839
1983	24.791953
1984	24.658325
1985	27.233216
1986	26.805641
1987	30.554315
1988	30.536168
1989	29.873721
1990	29.885974
1991	29.265086
1992	29.098563
1993	28.730493
1994	28.35734
1995	28.644825
1996	28.423366
1997	29.022023
1998	28.876885
1999	29.673443
2000	30.526706
2001	31.510897
2002	32.574431
2003	34.201173
2004	36.423631
2005	38.841456
2006	40.706264
2007	42.008907
2008	42.562392
2009	43.038588
2010	43.73231
2011	45.296857
2012	46.460419
2013	47.811005
2014	49.438549
2015	50.447431
2016	50.706266
2017	52.091115
2018	52.951116
2019	53.39508
2020	52.683745
2021	51.663767
2022	54.463454