Year	% of cohort
1960	34.126714
1961	34.734568
1962	37.141368
1963	37.600479
1964	37.904264
1965	38.772886
1966	39.350997
1967	40.269221
1968	41.329045
1969	42.411726
1970	43.196826
1971	44.175297
1972	45.0411
1973	45.607949
1974	45.815334
1975	46.088385
1976	46.461628
1977	46.556648
1978	47.02123
1979	47.405763
1980	48.026938
1981	48.335724
1982	48.688576
1983	49.561545
1984	49.953411
1985	50.459334
1986	50.380597
1987	51.694937
1988	51.972821
1989	51.869567
1990	51.918803
1991	51.774291
1992	51.845943
1993	50.969664
1994	50.043415
1995	49.644061
1996	48.796835
1997	48.634597
1998	48.155854
1999	48.421527
2000	48.483202
2001	48.536682
2002	48.415625
2003	49.071471
2004	49.443677
2005	49.067544
2006	49.868678
2007	50.200463
2008	51.028229
2009	51.659636
2010	52.527179
2011	53.290793
2012	54.327131
2013	55.447472
2014	56.354496
2015	57.71054
2016	58.174261
2017	59.104811
2018	60.245438
2019	60.423145
2020	59.436921
2021	57.69876
2022	58.645492