Year	% of cohort
1960	78.380595
1961	79.428054
1962	79.32488
1963	79.889344
1964	79.904769
1965	81.353573
1966	82.088989
1967	81.242639
1968	81.523883
1969	82.457379
1970	83.697778
1971	83.977506
1972	83.800929
1973	84.165893
1974	84.711179
1975	84.905227
1976	85.462625
1977	85.563427
1978	86.480934
1979	86.816969
1980	86.82456
1981	87.30367
1982	87.67815
1983	88.036121
1984	88.37056
1985	88.635731
1986	89.154681
1987	88.984015
1988	89.84653
1989	90.063572
1990	90.27627
1991	90.40626
1992	90.437919
1993	90.794972
1994	91.011063
1995	91.090783
1996	91.344878
1997	91.585497
1998	91.520254
1999	91.650949
2000	91.797244
2001	92.160971
2002	92.258151
2003	92.261282
2004	92.511366
2005	92.809494
2006	92.815533
2007	92.724474
2008	92.997059
2009	93.246672
2010	93.229877
2011	93.349446
2012	93.152084
2013	93.555487
2014	93.536046
2015	93.251555
2016	93.490251
2017	93.281658
2018	93.676001
2019	93.555973
2020	92.875074
2021	92.100353
2022	92.648841