Year	% of cohort
1960	18.413965
1961	18.478869
1962	18.540198
1963	18.863954
1964	19.168649
1965	19.208478
1966	19.504148
1967	19.776467
1968	20.194824
1969	20.543455
1970	21.008974
1971	21.328335
1972	22.35417
1973	23.070049
1974	24.061548
1975	25.084007
1976	26.469974
1977	27.73339
1978	29.058478
1979	30.373078
1980	31.642883
1981	32.294093
1982	33.007344
1983	33.523068
1984	34.020834
1985	34.67472
1986	35.699854
1987	36.520081
1988	37.405092
1989	38.449338
1990	39.418779
1991	40.538653
1992	40.753178
1993	40.613872
1994	40.447417
1995	40.765701
1996	40.92449
1997	41.908916
1998	42.929881
1999	43.982168
2000	44.976753
2001	45.712219
2002	46.703877
2003	47.363234
2004	48.00994
2005	48.4677
2006	49.287779
2007	49.716941
2008	50.048139
2009	50.755396
2010	51.317001
2011	51.706326
2012	51.984505
2013	52.04284
2014	52.919254
2015	53.516464
2016	54.251964
2017	54.581698
2018	54.508719
2019	55.066832
2020	51.502597
2021	51.747337
2022	52.493854