Year	% of cohort
1960	75.814437
1961	75.179862
1962	75.979764
1963	74.710922
1964	78.376794
1965	79.88953
1966	76.808516
1967	80.380246
1968	78.311174
1969	78.48266
1970	78.599339
1971	79.002268
1972	78.390147
1973	79.401795
1974	76.999523
1975	79.995792
1976	79.44201
1977	80.920661
1978	81.742665
1979	82.062983
1980	84.130593
1981	82.967487
1982	82.423649
1983	84.897253
1984	86.22454
1985	87.647445
1986	87.551692
1987	84.781753
1988	89.524895
1989	84.012015
1990	88.392173
1991	88.777038
1992	86.119256
1993	90.420349
1994	91.065268
1995	87.221903
1996	88.759839
1997	92.379173
1998	92.166839
1999	93.121101
2000	92.288349
2001	91.643955
2002	91.581535
2003	90.40379
2004	91.605766
2005	93.237446
2006	92.165146
2007	90.309687
2008	91.896615
2009	92.020315
2010	92.324787
2011	93.439709
2012	93.562953
2013	91.924665
2014	94.061674
2015	92.44032
2016	92.248491
2017	92.257605
2018	92.435923
2019	92.488807
2020	92.453315
2021	90.671423
2022	92.81939