Year	% of cohort
1960	70.458057
1961	67.139164
1962	72.06256
1963	68.198084
1964	72.551609
1965	71.448214
1966	72.252726
1967	73.936754
1968	69.877425
1969	70.387997
1970	69.516743
1971	70.654011
1972	70.929219
1973	71.502017
1974	71.723207
1975	70.519911
1976	72.490109
1977	73.001462
1978	73.675318
1979	72.195773
1980	74.160897
1981	75.070863
1982	77.36627
1983	75.54017
1984	79.771176
1985	78.261126
1986	78.873402
1987	80.828271
1988	81.716116
1989	82.051117
1990	81.896166
1991	81.518155
1992	83.174899
1993	80.676715
1994	83.742574
1995	83.235082
1996	83.637116
1997	84.140637
1998	85.194782
1999	85.278855
2000	85.665583
2001	85.892519
2002	85.342557
2003	86.513237
2004	87.216088
2005	87.544888
2006	87.953316
2007	88.643259
2008	88.786605
2009	88.365286
2010	88.564856
2011	89.262355
2012	88.907987
2013	89.095215
2014	89.490367
2015	89.041416
2016	88.941614
2017	88.907452
2018	88.956692
2019	89.0256
2020	88.883435
2021	88.850192
2022	89.307696