Year	% of cohort
1960	82.229837
1961	82.453704
1962	82.941956
1963	82.917258
1964	84.090765
1965	84.805037
1966	84.942227
1967	84.935957
1968	85.29623
1969	84.540354
1970	86.331508
1971	85.756972
1972	87.140759
1973	86.887623
1974	87.36873
1975	87.860324
1976	88.211704
1977	88.767997
1978	89.030097
1979	89.631213
1980	90.139708
1981	90.371764
1982	90.947527
1983	90.617231
1984	91.162789
1985	91.047651
1986	91.262752
1987	91.531098
1988	91.552132
1989	91.697751
1990	92.412711
1991	91.738043
1992	92.122628
1993	91.700676
1994	93.139551
1995	91.691309
1996	92.823855
1997	92.552211
1998	92.929821
1999	93.145765
2000	92.52451
2001	94.619985
2002	93.841057
2003	95.539304
2004	90.956584
2005	93.363595
2006	93.879309
2007	94.649185
2008	94.649185
2009	94.641899
2010	94.641899
2011	94.641899
2012	94.641899
2013	94.641899
2014	94.641899
2015	94.634604
2016	94.634604
2017	94.634604
2018	94.634604
2019	94.634604
2020	91.74041
2021	92.802338
2022	94.899708