Year	% of cohort
1960	36.745028
1961	37.571677
1962	38.315403
1963	39.096497
1964	39.535402
1965	40.634777
1966	41.340192
1967	41.898357
1968	42.576922
1969	43.074387
1970	44.004596
1971	44.72513
1972	45.359241
1973	45.733673
1974	46.374222
1975	46.912997
1976	47.578359
1977	48.315077
1978	48.968489
1979	49.45602
1980	50.054194
1981	50.299636
1982	50.857836
1983	51.65968
1984	52.070984
1985	52.6587
1986	53.380867
1987	53.59532
1988	53.893088
1989	54.364679
1990	54.517225
1991	54.648257
1992	55.366579
1993	55.462411
1994	55.535965
1995	55.381044
1996	55.091678
1997	55.045545
1998	55.622177
1999	55.442864
2000	55.247331
2001	55.717519
2002	55.458118
2003	55.57994
2004	55.948723
2005	55.842918
2006	56.333601
2007	56.577361
2008	56.724026
2009	56.500005
2010	57.352211
2011	56.966395
2012	57.684497
2013	57.649641
2014	57.670285
2015	58.29558
2016	59.00895
2017	58.929464
2018	59.181013
2019	60.304179
2020	59.67742
2021	57.767397
2022	57.506446