Year	% of cohort
1960	33.655631
1961	33.912817
1962	34.105635
1963	34.247998
1964	30.793718
1965	32.775858
1966	35.803733
1967	37.594498
1968	36.587189
1969	37.495131
1970	38.521422
1971	39.57209
1972	40.826259
1973	41.966933
1974	43.107052
1975	44.288948
1976	45.507797
1977	46.729447
1978	47.911539
1979	49.203825
1980	50.075633
1981	51.126302
1982	52.141153
1983	53.176589
1984	54.229557
1985	55.025744
1986	56.051404
1987	56.853158
1988	59.542429
1989	58.43727
1990	56.663524
1991	55.762458
1992	54.299737
1993	53.686789
1994	54.486344
1995	54.091826
1996	55.56806
1997	55.82318
1998	56.891469
1999	57.421622
2000	58.38346
2001	58.921848
2002	59.671024
2003	61.680145
2004	62.270664
2005	63.268908
2006	63.945268
2007	64.817987
2008	65.501379
2009	66.344283
2010	67.164379
2011	69.122285
2012	69.461882
2013	69.907111
2014	69.827842
2015	69.985826
2016	70.172327
2017	70.608594
2018	70.968383
2019	71.275387
2020	71.164735
2021	67.393285
2022	67.967198