Year	% of cohort
1960	47.553825
1961	48.587407
1962	49.62332
1963	49.545556
1964	50.115901
1965	50.781258
1966	50.764123
1967	51.335938
1968	51.930759
1969	52.465894
1970	52.518039
1971	53.144582
1972	53.517105
1973	53.722429
1974	53.920689
1975	54.12015
1976	54.324933
1977	54.367756
1978	54.887373
1979	54.640775
1980	55.598808
1981	56.319858
1982	56.806271
1983	58.306494
1984	59.226133
1985	59.889814
1986	60.172052
1987	60.492654
1988	61.472123
1989	61.836908
1990	62.706321
1991	63.024828
1992	63.092512
1993	63.88932
1994	63.919878
1995	65.092759
1996	65.73705
1997	66.654407
1998	67.165422
1999	67.684231
2000	68.106465
2001	69.522254
2002	68.539979
2003	70.067978
2004	70.291096
2005	70.244074
2006	71.078158
2007	70.850722
2008	70.522344
2009	70.267277
2010	70.376614
2011	70.414951
2012	70.392675
2013	70.499358
2014	70.260915
2015	69.856568
2016	69.988714
2017	69.247829
2018	68.458499
2019	67.444124
2020	66.073868
2021	66.135902
2022	66.500507