Year	% of cohort
1960	61.113076
1961	61.724129
1962	61.733213
1963	63.17466
1964	64.161733
1965	64.493389
1966	64.829095
1967	64.546279
1968	63.487199
1969	63.429125
1970	63.703862
1971	63.656012
1972	64.196832
1973	65.072191
1974	65.678574
1975	66.101031
1976	67.263762
1977	67.771596
1978	68.278634
1979	69.253126
1980	69.841088
1981	70.819931
1982	71.738243
1983	71.640151
1984	71.46258
1985	72.112083
1986	72.541276
1987	74.08047
1988	74.472378
1989	75.317041
1990	75.499655
1991	74.968125
1992	75.067362
1993	74.409071
1994	73.685416
1995	73.028788
1996	72.218599
1997	71.455586
1998	70.492162
1999	70.133562
2000	69.905439
2001	69.151461
2002	68.705896
2003	68.001218
2004	67.475528
2005	67.936749
2006	68.462382
2007	69.706685
2008	70.739649
2009	71.852042
2010	72.92249
2011	74.177363
2012	76.135631
2013	76.572116
2014	75.259627
2015	73.022271
2016	71.35286
2017	70.719527
2018	70.215691
2019	70.101547
2020	70.365338
2021	67.874674
2022	67.953693