Year	% of cohort
1960	28.955126
1961	30.493958
1962	32.026973
1963	33.465217
1964	34.841909
1965	35.826682
1966	36.789033
1967	37.831867
1968	38.715694
1969	39.315929
1970	40.345441
1971	41.645221
1972	43.180913
1973	44.442423
1974	45.730586
1975	46.69872
1976	45.818889
1977	45.826479
1978	45.803875
1979	45.818776
1980	45.835814
1981	45.871247
1982	45.884438
1983	46.374402
1984	46.897117
1985	46.411296
1986	46.142548
1987	46.661821
1988	47.26149
1989	47.84187
1990	48.329011
1991	48.936171
1992	49.378019
1993	49.873194
1994	50.262906
1995	50.71352
1996	48.98121
1997	49.515272
1998	51.4228
1999	52.747321
2000	52.195191
2001	50.608134
2002	49.224024
2003	49.300478
2004	49.986249
2005	49.217109
2006	50.668074
2007	51.3051
2008	51.95332
2009	52.316912
2010	52.882058
2011	53.787554
2012	54.869045
2013	55.826442
2014	56.862852
2015	57.817479
2016	58.525194
2017	59.517682
2018	60.612683
2019	61.65052
2020	62.244523
2021	60.409294
2022	63.13582