Year	% of cohort
1960	56.151208
1961	57.346938
1962	58.095039
1963	59.182943
1964	59.922395
1965	60.748005
1966	61.574036
1967	61.783123
1968	61.850663
1969	61.871538
1970	62.314872
1971	62.775851
1972	63.263353
1973	64.214328
1974	65.143432
1975	65.827594
1976	65.983513
1977	66.370516
1978	66.265898
1979	66.556811
1980	66.54046
1981	66.717537
1982	66.861326
1983	66.992658
1984	67.34756
1985	67.426124
1986	67.857281
1987	69.293731
1988	69.136554
1989	69.269673
1990	69.60874
1991	68.592372
1992	22.819422
1993	21.999569
1994	51.358662
1995	63.372219
1996	71.511337
1997	72.2501
1998	73.195475
1999	74.855656
2000	73.780995
2001	74.638409
2002	75.153695
2003	76.260416
2004	77.280024
2005	75.475454
2006	77.0926
2007	77.244687
2008	78.596464
2009	79.005954
2010	79.584979
2011	79.940176
2012	79.910162
2013	79.272501
2014	78.81668
2015	80.184957
2016	81.415158
2017	81.804178
2018	82.391557
2019	82.988013
2020	81.113012
2021	79.435279
2022	79.470825