Year	% of cohort
1960	61.231859
1961	61.139339
1962	60.426117
1963	60.854082
1964	60.91879
1965	60.395675
1966	61.59607
1967	61.317509
1968	61.309904
1969	60.478846
1970	61.987714
1971	61.058432
1972	62.905016
1973	63.457312
1974	63.516231
1975	64.724047
1976	64.762365
1977	65.227584
1978	66.822679
1979	67.82442
1980	68.806985
1981	69.119723
1982	70.306621
1983	71.087882
1984	71.093053
1985	70.713531
1986	71.345851
1987	72.059375
1988	72.126423
1989	72.044168
1990	72.727228
1991	73.577553
1992	74.534195
1993	75.598356
1994	76.593787
1995	76.786844
1996	77.358803
1997	77.932576
1998	78.047674
1999	78.194003
2000	79.010004
2001	79.813633
2002	80.362862
2003	80.144572
2004	79.993425
2005	79.751616
2006	80.715636
2007	80.511653
2008	80.873959
2009	81.68711
2010	82.091232
2011	82.825941
2012	83.600637
2013	84.067945
2014	84.638243
2015	85.336324
2016	85.256214
2017	85.785162
2018	85.926805
2019	86.639122
2020	85.942293
2021	87.304392
2022	87.129487