Year	% of cohort
1960	46.736403
1961	47.166918
1962	47.644861
1963	48.138107
1964	48.622823
1965	49.071052
1966	49.552772
1967	50.022245
1968	50.484353
1969	51.042297
1970	51.443569
1971	51.781281
1972	51.980199
1973	52.266462
1974	52.658307
1975	53.004244
1976	53.42381
1977	53.600026
1978	54.092175
1979	54.430523
1980	54.729284
1981	55.01957
1982	54.977072
1983	55.31323
1984	55.509332
1985	55.825585
1986	56.046519
1987	56.279744
1988	56.525654
1989	56.788359
1990	57.053259
1991	57.39387
1992	57.711424
1993	58.0535
1994	58.410398
1995	58.766792
1996	59.154582
1997	59.631306
1998	59.970428
1999	60.40405
2000	60.87406
2001	61.387083
2002	61.920619
2003	62.374607
2004	62.885302
2005	63.34243
2006	63.725189
2007	64.199166
2008	64.518285
2009	64.358635
2010	64.871784
2011	64.983132
2012	65.13912
2013	65.312371
2014	65.442797
2015	65.60056
2016	65.737475
2017	65.883657
2018	66.050633
2019	66.275225
2020	66.398672
2021	66.632787
2022	66.889735