Year	% of cohort
1960	37.771367
1961	38.848846
1962	40.304808
1963	41.742284
1964	43.088683
1965	44.518737
1966	45.744807
1967	47.45737
1968	49.033973
1969	50.287197
1970	52.321798
1971	54.011518
1972	56.507266
1973	58.313102
1974	60.201897
1975	62.413205
1976	64.055774
1977	66.05499
1978	67.971341
1979	69.644335
1980	71.06832
1981	72.117987
1982	73.166387
1983	74.469593
1984	75.547785
1985	76.678854
1986	77.761971
1987	78.81864
1988	80.069661
1989	80.413396
1990	80.808828
1991	81.146764
1992	81.300914
1993	81.922953
1994	82.340604
1995	82.864104
1996	83.217967
1997	83.676104
1998	84.35089
1999	85.025374
2000	85.262468
2001	85.421101
2002	85.685161
2003	85.945376
2004	86.198768
2005	86.399354
2006	86.59095
2007	86.770689
2008	86.916657
2009	87.133867
2010	87.255902
2011	87.376101
2012	87.525278
2013	87.694071
2014	87.768737
2015	87.869953
2016	88.456138
2017	88.494692
2018	88.533276
2019	88.607225
2020	88.662234
2021	86.027062
2022	86.405285