Year	% of cohort
1960	32.407755
1961	32.497429
1962	32.285143
1963	32.61278
1964	32.719907
1965	32.493802
1966	32.897211
1967	33.019746
1968	33.243631
1969	33.42672
1970	34.176762
1971	34.761549
1972	35.466059
1973	36.660872
1974	37.684299
1975	39.023334
1976	40.564411
1977	42.264549
1978	43.985665
1979	45.606621
1980	47.254198
1981	48.44339
1982	49.561812
1983	50.599731
1984	52.21405
1985	53.403425
1986	55.428554
1987	56.776878
1988	58.590173
1989	59.746922
1990	60.636922
1991	60.648997
1992	60.40609
1993	60.028803
1994	59.62291
1995	59.261924
1996	58.753815
1997	58.579001
1998	57.930971
1999	57.602659
2000	57.777685
2001	58.629681
2002	59.191211
2003	60.854499
2004	61.960611
2005	63.399585
2006	64.767411
2007	66.185465
2008	67.424312
2009	68.868767
2010	70.205531
2011	71.634943
2012	71.983547
2013	73.332076
2014	73.489436
2015	74.648026
2016	75.857444
2017	76.250707
2018	76.491192
2019	77.729079
2020	76.227589
2021	73.959123
2022	75.450748