Year	% of cohort
1960	34.551745
1961	35.615195
1962	36.707776
1963	38.829664
1964	40.507805
1965	42.451271
1966	44.973556
1967	47.044301
1968	49.036863
1969	50.837622
1970	53.285104
1971	49.157869
1972	54.040995
1973	54.681843
1974	54.628186
1975	55.5739
1976	56.117404
1977	56.675208
1978	57.634472
1979	58.909123
1980	59.910945
1981	61.120186
1982	61.993995
1983	63.27302
1984	64.145763
1985	62.648976
1986	62.117735
1987	60.905455
1988	61.968084
1989	62.510778
1990	63.746465
1991	63.378638
1992	61.916732
1993	60.906281
1994	61.22876
1995	60.474714
1996	61.620657
1997	62.247291
1998	63.31631
1999	64.399109
2000	64.93731
2001	65.669704
2002	65.627606
2003	66.123718
2004	66.888844
2005	66.133288
2006	69.222558
2007	70.038262
2008	70.736735
2009	70.683836
2010	71.307767
2011	71.509582
2012	71.606365
2013	72.32202
2014	72.375272
2015	73.149071
2016	73.313878
2017	74.172917
2018	74.319961
2019	74.450533
2020	73.764099
2021	73.14093
2022	73.755113