Year	% of cohort
1960	57.519117
1961	58.401812
1962	58.776944
1963	59.636962
1964	60.542684
1965	62.030774
1966	63.227443
1967	63.873986
1968	65.031322
1969	65.242219
1970	67.571579
1971	68.620296
1972	69.621487
1973	70.484838
1974	71.529814
1975	72.571654
1976	73.223014
1977	74.412003
1978	75.224399
1979	75.533917
1980	75.925709
1981	77.066227
1982	77.571663
1983	78.308637
1984	78.458341
1985	78.68205
1986	79.322379
1987	79.390129
1988	79.860616
1989	80.28339
1990	80.226081
1991	81.069992
1992	81.056905
1993	81.59454
1994	81.738015
1995	82.081781
1996	81.978299
1997	82.984807
1998	83.333835
1999	82.788067
2000	83.833134
2001	82.547033
2002	84.125894
2003	83.418294
2004	83.971933
2005	84.379438
2006	84.578469
2007	85.003902
2008	84.403542
2009	84.358868
2010	84.497169
2011	84.363552
2012	84.729755
2013	84.592695
2014	84.289299
2015	84.468131
2016	83.822856
2017	83.037125
2018	83.33379
2019	83.607734
2020	82.270457
2021	81.318393
2022	82.058206