Year	% of cohort
1960	26.658968
1961	26.995632
1962	27.137077
1963	19.512211
1964	19.821768
1965	20.209809
1966	20.44667
1967	20.71046
1968	21.064793
1969	21.520947
1970	21.753964
1971	22.143392
1972	22.555805
1973	22.847159
1974	31.024589
1975	31.366648
1976	31.873749
1977	32.073634
1978	32.484841
1979	32.99146
1980	33.461678
1981	33.700093
1982	34.185479
1983	34.545779
1984	34.668997
1985	35.097357
1986	35.376069
1987	35.838001
1988	36.579579
1989	36.888835
1990	37.239334
1991	37.550373
1992	38.091133
1993	38.395835
1994	37.838275
1995	38.776822
1996	38.495599
1997	35.984452
1998	31.911749
1999	32.719618
2000	37.466428
2001	37.712232
2002	38.321513
2003	38.893943
2004	39.95989
2005	39.902554
2006	41.56888
2007	42.964484
2008	43.327436
2009	44.374694
2010	45.042656
2011	46.394853
2012	47.492086
2013	48.224772
2014	48.664223
2015	49.390717
2016	50.219948
2017	51.075218
2018	51.395201
2019	52.229574
2020	48.436285
2021	47.580897
2022	48.057062