Year	% of cohort
1960	38.853467
1961	39.400472
1962	40.127765
1963	40.095009
1964	40.796907
1965	41.92028
1966	43.165857
1967	44.075385
1968	45.247145
1969	46.35214
1970	47.006217
1971	47.601008
1972	47.963207
1973	48.576231
1974	49.311941
1975	50.331673
1976	51.735081
1977	53.62695
1978	55.125729
1979	56.459287
1980	57.198795
1981	57.938281
1982	58.886503
1983	57.39482
1984	59.823955
1985	60.831542
1986	61.771918
1987	62.703703
1988	63.979263
1989	63.972836
1990	64.741984
1991	64.040301
1992	62.356553
1993	59.367368
1994	55.583976
1995	51.37336
1996	46.297583
1997	42.433424
1998	39.05722
1999	35.147358
2000	31.439622
2001	29.284974
2002	26.048965
2003	22.817007
2004	20.803364
2005	19.612394
2006	21.127315
2007	21.650628
2008	22.554719
2009	22.206268
2010	26.42256
2011	29.333805
2012	32.740617
2013	36.655038
2014	40.760971
2015	45.30578
2016	49.473026
2017	53.150944
2018	56.557519
2019	59.004232
2020	57.596565
2021	52.538865
2022	51.209477