Year	% of cohort
1960	65.209988
1961	66.313547
1962	66.579629
1963	64.853463
1964	65.727524
1965	65.279654
1966	65.161733
1967	64.904561
1968	60.409325
1969	63.093588
1970	63.27556
1971	64.035671
1972	59.313811
1973	64.020009
1974	63.323524
1975	72.013511
1976	74.045934
1977	74.477416
1978	75.651608
1979	76.106891
1980	76.300447
1981	76.601895
1982	77.705036
1983	77.720368
1984	77.927557
1985	77.986959
1986	79.13002
1987	79.326429
1988	79.543674
1989	80.612949
1990	80.818267
1991	81.845423
1992	81.998605
1993	83.062971
1994	83.253099
1995	84.093698
1996	84.178922
1997	84.139451
1998	84.6717
1999	84.974233
2000	85.079507
2001	85.311671
2002	85.544018
2003	85.796361
2004	86.027898
2005	86.105762
2006	86.181712
2007	86.365324
2008	86.390444
2009	86.42267
2010	86.424802
2011	86.596482
2012	86.60474
2013	86.667913
2014	86.804184
2015	86.876827
2016	86.984881
2017	86.94256
2018	87.009594
2019	87.140526
2020	88.300898
2021	86.817325
2022	87.611841