Year	% of cohort
1960	35.928518
1961	36.34726
1962	36.573032
1963	36.993434
1964	37.205763
1965	37.679541
1966	37.947352
1967	38.319426
1968	38.494885
1969	18.33018
1970	18.439352
1971	26.987877
1972	37.373418
1973	37.734551
1974	32.619882
1975	26.077949
1976	16.313912
1977	32.830975
1978	33.14101
1979	37.125629
1980	43.352859
1981	44.042511
1982	44.672837
1983	45.198915
1984	45.172382
1985	46.021572
1986	46.54063
1987	46.745043
1988	47.212387
1989	47.484051
1990	47.559358
1991	47.625575
1992	47.90974
1993	48.15664
1994	48.216103
1995	48.542865
1996	48.717178
1997	49.237985
1998	49.534734
1999	50.208911
2000	50.988945
2001	51.312212
2002	51.920427
2003	52.503621
2004	53.061785
2005	53.647084
2006	54.502669
2007	55.231807
2008	56.053035
2009	56.351758
2010	57.024894
2011	57.985441
2012	58.674847
2013	59.082373
2014	59.775767
2015	60.815263
2016	61.093356
2017	61.939615
2018	62.088376
2019	62.932104
2020	61.234629
2021	60.41341
2022	61.340501