Year	% of cohort
1960	69.993822
1961	71.035584
1962	70.78298
1963	71.792747
1964	72.877466
1965	73.249492
1966	72.842961
1967	71.441639
1968	72.408551
1969	70.74954
1970	72.372015
1971	71.175362
1972	71.266177
1973	72.220717
1974	71.908114
1975	71.039769
1976	71.757489
1977	69.997189
1978	70.490741
1979	69.878079
1980	69.838492
1981	70.079175
1982	69.104562
1983	68.99505
1984	68.380323
1985	67.462553
1986	67.789773
1987	67.966652
1988	67.549813
1989	67.265587
1990	67.01759
1991	67.261234
1992	66.156695
1993	65.268281
1994	64.036321
1995	64.114144
1996	64.761754
1997	63.688914
1998	64.198453
1999	66.314139
2000	66.470231
2001	66.38616
2002	67.185006
2003	67.42358
2004	67.291092
2005	67.073671
2006	67.367737
2007	68.196165
2008	68.69542
2009	69.125352
2010	69.99903
2011	70.374
2012	70.92221
2013	71.553003
2014	70.819653
2015	71.292433
2016	71.094008
2017	71.646132
2018	71.68673
2019	71.804344
2020	68.773719
2021	65.379498
2022	65.003225