Year	% of cohort
1960	37.053553
1961	38.221132
1962	39.221625
1963	40.052943
1964	40.692278
1965	41.126222
1966	41.245443
1967	41.658314
1968	42.393766
1969	43.14404
1970	44.730474
1971	46.599586
1972	48.709712
1973	50.924098
1974	52.966934
1975	54.699693
1976	43.625258
1977	57.37092
1978	58.407223
1979	59.2369
1980	59.837426
1981	60.811928
1982	54.456171
1983	62.860903
1984	63.681788
1985	64.408545
1986	65.07339
1987	65.684243
1988	66.286199
1989	66.748494
1990	66.924141
1991	67.467657
1992	67.84465
1993	68.384957
1994	69.190836
1995	70.121003
1996	71.300498
1997	72.480191
1998	73.33635
1999	74.457778
2000	75.047252
2001	75.345268
2002	75.456426
2003	75.513787
2004	75.595947
2005	75.131747
2006	76.218914
2007	76.728492
2008	77.245675
2009	77.768622
2010	78.09962
2011	78.438776
2012	78.64273
2013	78.797087
2014	78.922944
2015	78.949647
2016	79.26178
2017	79.444383
2018	79.446645
2019	79.646451
2020	78.029041
2021	74.079034
2022	72.591535