Year	% of cohort
1960	39.619195
1961	40.240178
1962	40.847408
1963	40.944795
1964	46.053294
1965	41.970944
1966	38.304069
1967	38.962922
1968	39.615154
1969	39.491764
1970	40.114308
1971	47.338355
1972	47.148179
1973	51.349754
1974	51.63543
1975	51.800329
1976	52.007642
1977	52.21779
1978	51.282971
1979	51.513394
1980	52.821073
1981	53.192477
1982	53.443736
1983	44.635208
1984	43.444641
1985	43.829901
1986	51.51508
1987	42.193163
1988	32.413074
1989	49.412871
1990	50.031414
1991	50.685286
1992	45.406663
1993	46.349398
1994	58.081713
1995	53.095554
1996	53.53996
1997	54.471536
1998	49.682088
1999	59.3084
2000	61.181041
2001	61.616761
2002	62.101778
2003	61.272615
2004	59.604624
2005	60.368392
2006	63.592134
2007	65.3006
2008	65.064676
2009	67.342929
2010	67.568725
2011	68.005445
2012	69.120281
2013	69.294163
2014	70.380997
2015	70.490319
2016	70.546452
2017	71.543641
2018	71.839712
2019	72.035443
2020	71.687868
2021	70.949612
2022	71.435972