Year	% of cohort
1960	54.348177
1961	55.429947
1962	56.427461
1963	57.336653
1964	58.15273
1965	58.871389
1966	59.519727
1967	60.137479
1968	60.772459
1969	61.45921
1970	62.237926
1971	63.099406
1972	64.004598
1973	64.92786
1974	65.835849
1975	66.704896
1976	67.533427
1977	68.333835
1978	69.121992
1979	69.902368
1980	70.696768
1981	71.500226
1982	72.293684
1983	73.055271
1984	73.780669
1985	74.4679
1986	75.113764
1987	75.715602
1988	76.274929
1989	76.782581
1990	77.245548
1991	77.652383
1992	78.028227
1993	78.375459
1994	78.72272
1995	79.080984
1996	79.470348
1997	79.862916
1998	80.255139
1999	80.626742
2000	80.968825
2001	81.272825
2002	81.537008
2003	81.757414
2004	81.935943
2005	82.059418
2006	82.169864
2007	82.267024
2008	82.390235
2009	82.568217
2010	82.835603
2011	83.179573
2012	83.531632
2013	83.819452
2014	83.974007
2015	83.921652
2016	83.704469
2017	83.488872
2018	83.475692
2019	83.856661
2020	77.587742
2021	78.872782
2022	84.656881