Year	% of cohort
1960	61.276701
1961	59.812514
1962	61.072832
1963	62.096328
1964	62.06232
1965	62.937121
1966	61.236249
1967	62.59491
1968	63.854463
1969	62.480293
1970	64.46528
1971	63.28363
1972	66.705143
1973	66.647269
1974	66.863517
1975	64.568348
1976	65.03882
1977	67.3977
1978	68.909895
1979	70.222395
1980	69.713933
1981	69.578718
1982	71.182388
1983	71.236607
1984	71.282139
1985	72.105812
1986	72.502117
1987	73.290297
1988	73.177169
1989	74.341761
1990	73.705945
1991	73.252589
1992	74.028811
1993	74.006463
1994	75.794983
1995	75.373984
1996	75.013571
1997	75.991056
1998	76.528594
1999	77.065243
2000	77.865484
2001	78.140591
2002	78.615526
2003	79.193495
2004	80.05513
2005	80.075764
2006	80.639127
2007	81.208777
2008	81.827498
2009	82.030809
2010	82.406262
2011	82.713545
2012	83.307875
2013	83.284541
2014	83.877174
2015	84.176305
2016	84.073721
2017	84.339252
2018	84.260552
2019	84.751417
2020	83.850969
2021	84.078117
2022	85.625247