Year	% of cohort
1960	78.217351
1961	78.842304
1962	78.614493
1963	78.398526
1964	78.678819
1965	78.905771
1966	79.084443
1967	79.448876
1968	79.030193
1969	79.485345
1970	79.621836
1971	80.063825
1972	80.355632
1973	80.577302
1974	81.269686
1975	81.938968
1976	82.264434
1977	82.665173
1978	82.900822
1979	83.483615
1980	83.412445
1981	83.701062
1982	84.067376
1983	84.134416
1984	84.267374
1985	84.335492
1986	84.471199
1987	84.583587
1988	84.553999
1989	84.859
1990	85.145083
1991	85.266684
1992	85.551791
1993	85.388443
1994	85.542187
1995	85.594196
1996	85.861594
1997	86.122082
1998	86.393867
1999	86.408461
2000	86.515621
2001	86.546664
2002	86.659299
2003	86.699123
2004	87.053591
2005	87.099775
2006	87.271537
2007	87.546887
2008	87.649289
2009	87.754436
2010	88.066423
2011	88.028523
2012	88.081335
2013	88.041672
2014	87.886847
2015	87.755129
2016	87.547378
2017	87.55521
2018	87.735705
2019	87.799779
2020	86.450152
2021	85.23758
2022	86.438982