Year	% of cohort
1960	79.594071
1961	80.144567
1962	80.004883
1963	80.116665
1964	81.649637
1965	81.764374
1966	81.92109
1967	82.364575
1968	81.974942
1969	82.651452
1970	82.193726
1971	82.069077
1972	82.11343
1973	82.111112
1974	82.148609
1975	81.874762
1976	81.624683
1977	81.721426
1978	81.248789
1979	81.61702
1980	81.11729
1981	81.253888
1982	81.708468
1983	81.216299
1984	81.268181
1985	81.049596
1986	80.909677
1987	81.187394
1988	81.494231
1989	80.542439
1990	81.0991
1991	81.285326
1992	80.72907
1993	80.163378
1994	82.152383
1995	81.864205
1996	81.9678
1997	81.662203
1998	81.724003
1999	81.239063
2000	82.187051
2001	81.551557
2002	81.200409
2003	81.775087
2004	82.274525
2005	82.419985
2006	82.950415
2007	83.659723
2008	83.875008
2009	84.00185
2010	84.213509
2011	84.820031
2012	85.704764
2013	85.897326
2014	86.733576
2015	87.154043
2016	87.542674
2017	87.911222
2018	88.17545
2019	88.411635
2020	87.053777
2021	86.649695
2022	87.443828