Year	% of cohort
1960	69.858435
1961	68.870541
1962	69.754608
1963	69.771741
1964	69.067631
1965	68.559752
1966	68.341432
1967	68.216616
1968	68.458098
1969	69.136101
1970	68.440471
1971	68.991466
1972	69.752345
1973	68.866343
1974	69.729987
1975	69.771164
1976	70.842137
1977	70.088821
1978	71.060879
1979	71.430768
1980	72.715677
1981	72.927595
1982	73.307142
1983	73.874345
1984	74.640604
1985	74.329731
1986	74.411102
1987	75.132314
1988	75.226505
1989	76.349392
1990	77.37965
1991	78.544085
1992	78.409256
1993	79.614783
1994	80.567608
1995	80.240239
1996	80.259001
1997	81.049344
1998	82.013434
1999	82.042272
2000	83.688795
2001	83.971979
2002	84.208873
2003	84.596365
2004	85.436352
2005	85.47659
2006	85.76425
2007	85.887683
2008	86.237072
2009	86.522062
2010	87.045956
2011	87.070622
2012	87.491985
2013	87.827791
2014	87.688931
2015	87.75975
2016	87.689942
2017	87.554155
2018	87.771663
2019	87.830913
2020	88.067662
2021	87.015552
2022	88.651867