Year	% of cohort
1960	44.015407
1961	45.66289
1962	47.564792
1963	49.106577
1964	50.507441
1965	52.063855
1966	52.918869
1967	53.762789
1968	54.376873
1969	55.299805
1970	56.260291
1971	57.183261
1972	58.131962
1973	59.174659
1974	60.287731
1975	61.213388
1976	62.347291
1977	62.727161
1978	63.677536
1979	64.65859
1980	65.521022
1981	66.632494
1982	67.418485
1983	68.007552
1984	68.67592
1985	69.539346
1986	69.609556
1987	69.994647
1988	70.409124
1989	70.840175
1990	71.263053
1991	71.473124
1992	71.399235
1993	72.047851
1994	72.595598
1995	72.882726
1996	72.655808
1997	72.379607
1998	71.980436
1999	72.03594
2000	72.914041
2001	73.900159
2002	74.240882
2003	74.427473
2004	74.567745
2005	74.89876
2006	75.041697
2007	75.032503
2008	74.900339
2009	74.393483
2010	74.504135
2011	74.824261
2012	75.161746
2013	75.309383
2014	75.514633
2015	75.290751
2016	75.62946
2017	75.95946
2018	76.333556
2019	76.674146
2020	77.039977
2021	75.946103
2022	77.499413