Year	% of cohort
1960	24.764575
1961	25.140311
1962	25.783046
1963	26.237048
1964	26.42646
1965	27.000085
1966	27.290349
1967	27.808976
1968	28.044007
1969	28.459092
1970	28.950439
1971	29.298083
1972	30.108743
1973	30.587026
1974	31.63055
1975	32.851594
1976	34.028387
1977	35.040887
1978	36.262086
1979	37.253691
1980	38.231844
1981	38.649012
1982	39.742083
1983	40.449263
1984	41.326888
1985	41.647203
1986	41.656724
1987	41.466917
1988	41.516768
1989	41.437547
1990	41.646207
1991	41.616921
1992	41.544443
1993	40.96093
1994	40.796388
1995	40.962427
1996	40.957838
1997	40.529366
1998	41.289503
1999	41.428956
2000	41.883702
2001	42.11656
2002	42.406139
2003	43.1913
2004	44.059961
2005	44.662878
2006	45.750868
2007	46.598934
2008	47.864589
2009	48.986787
2010	49.56643
2011	50.386331
2012	51.122436
2013	51.332401
2014	51.992136
2015	52.673699
2016	53.343338
2017	53.448668
2018	54.246291
2019	53.816967
2020	51.916905
2021	50.69926
2022	51.50119