Year	% of cohort
1960	54.400405
1961	55.411264
1962	56.529764
1963	57.620192
1964	59.593746
1965	60.773205
1966	62.103295
1967	63.932344
1968	65.182986
1969	66.266872
1970	67.423228
1971	68.546637
1972	69.50374
1973	69.99966
1974	70.789778
1975	71.716633
1976	72.158939
1977	73.201164
1978	73.598206
1979	74.515172
1980	74.789892
1981	75.788948
1982	76.086428
1983	76.412894
1984	77.353324
1985	77.627707
1986	77.905816
1987	78.737768
1988	79.214297
1989	79.902631
1990	80.409753
1991	80.544807
1992	80.307456
1993	80.663942
1994	80.807245
1995	80.268581
1996	80.737987
1997	80.886459
1998	80.900755
1999	80.751646
2000	80.789426
2001	81.32825
2002	81.738986
2003	81.948062
2004	82.557106
2005	82.240752
2006	82.959876
2007	83.974123
2008	84.958054
2009	85.915333
2010	87.044001
2011	88.152736
2012	88.90538
2013	89.263349
2014	89.657436
2015	90.178779
2016	90.678318
2017	91.007274
2018	91.134369
2019	91.103228
2020	89.431759
2021	89.400508
2022	91.71742