Year	% of cohort
1960	83.208733
1961	84.061835
1962	84.883149
1963	85.936861
1964	86.937349
1965	87.261536
1966	86.522391
1967	86.043033
1968	86.068396
1969	86.199895
1970	86.391915
1971	86.360439
1972	86.057546
1973	86.598817
1974	87.137899
1975	87.471369
1976	86.463184
1977	85.742219
1978	85.434744
1979	85.898129
1980	86.463063
1981	86.960348
1982	87.48442
1983	88.051145
1984	88.234749
1985	88.688359
1986	88.812212
1987	88.426987
1988	88.362105
1989	88.798086
1990	89.182037
1991	87.498103
1992	84.116261
1993	87.288206
1994	87.701079
1995	86.417388
1996	85.959341
1997	88.415159
1998	88.374194
1999	88.259562
2000	89.445267
2001	89.033002
2002	87.989557
2003	89.106094
2004	87.116928
2005	87.692053
2006	89.897031
2007	90.211532
2008	89.602569
2009	89.048971
2010	88.974037
2011	90.070017
2012	90.837553
2013	91.06369
2014	91.877393
2015	91.783139
2016	91.334189
2017	89.100791
2018	89.731334
2019	90.558918
2020	90.884587
2021	90.751778
2022	91.203638