Year	% of cohort
1960	34.558517
1961	36.64249
1962	37.322126
1963	37.944188
1964	39.175456
1965	40.325563
1966	41.128145
1967	41.938984
1968	42.723936
1969	43.77116
1970	44.985732
1971	46.23072
1972	47.069479
1973	48.251581
1974	49.38051
1975	50.490392
1976	51.666195
1977	52.191139
1978	52.612426
1979	53.104844
1980	54.267414
1981	55.305584
1982	56.699762
1983	58.070265
1984	59.758584
1985	61.313536
1986	62.805974
1987	64.65845
1988	64.880187
1989	65.343434
1990	65.55486
1991	65.743642
1992	65.762051
1993	65.691503
1994	65.652259
1995	64.486021
1996	65.52404
1997	67.170484
1998	67.916249
1999	67.475466
2000	67.077764
2001	67.55424
2002	67.966415
2003	68.213893
2004	68.002745
2005	69.012999
2006	70.374081
2007	70.548936
2008	70.85197
2009	71.276291
2010	71.548153
2011	71.802872
2012	72.167522
2013	72.484986
2014	72.905652
2015	73.293064
2016	73.485615
2017	74.055223
2018	74.41458
2019	74.906925
2020	75.418723
2021	75.628596
2022	76.239345