Year	% of cohort
1960	63.42962
1961	64.765744
1962	61.344037
1963	63.473935
1964	63.358081
1965	62.693457
1966	63.308004
1967	63.025197
1968	64.741972
1969	63.669073
1970	64.000264
1971	63.071872
1972	65.593877
1973	64.522392
1974	65.344415
1975	65.749133
1976	64.752368
1977	67.371757
1978	67.624057
1979	69.554088
1980	70.239576
1981	70.166494
1982	70.300948
1983	71.03245
1984	71.730143
1985	72.616531
1986	73.138594
1987	74.099654
1988	74.615905
1989	75.286068
1990	77.050737
1991	77.344701
1992	76.675629
1993	77.466876
1994	78.747772
1995	78.471397
1996	78.667872
1997	79.712817
1998	79.52919
1999	80.708419
2000	80.868855
2001	81.879348
2002	81.733979
2003	81.081395
2004	83.16293
2005	83.842501
2006	84.191085
2007	83.713313
2008	85.581522
2009	85.621854
2010	85.283595
2011	85.704313
2012	86.252563
2013	86.842253
2014	86.344632
2015	87.160728
2016	87.17845
2017	87.100797
2018	87.206486
2019	87.502592
2020	87.23671
2021	89.04249
2022	88.127378