Year	% of cohort
1960	58.298346
1961	58.49629
1962	59.0836
1963	59.669754
1964	59.722251
1965	60.018779
1966	60.886307
1967	60.885982
1968	61.385593
1969	61.952597
1970	62.645051
1971	62.844429
1972	63.479471
1973	64.144069
1974	64.739067
1975	64.376152
1976	64.308039
1977	64.978897
1978	65.541232
1979	66.100454
1980	66.747084
1981	66.883371
1982	66.912968
1983	68.095219
1984	68.365911
1985	69.379654
1986	69.358827
1987	69.671922
1988	70.104877
1989	70.691521
1990	70.465832
1991	70.93824
1992	70.852909
1993	70.527533
1994	70.739376
1995	71.271911
1996	72.081875
1997	72.249738
1998	73.078691
1999	73.77343
2000	72.928173
2001	73.615503
2002	74.238542
2003	74.85663
2004	74.642718
2005	75.003735
2006	75.93965
2007	75.951174
2008	76.829113
2009	77.763909
2010	78.394074
2011	79.15893
2012	79.669779
2013	79.76196
2014	81.014541
2015	80.48963
2016	81.644987
2017	81.970066
2018	82.477384
2019	83.515928
2020	81.045367
2021	81.848439
2022	82.792184