Year	% of cohort
1960	43.262891
1961	44.563023
1962	46.079468
1963	47.120318
1964	48.514801
1965	47.299304
1966	47.617639
1967	47.979029
1968	48.213962
1969	48.479085
1970	48.733678
1971	48.708367
1972	48.69821
1973	48.973858
1974	49.287376
1975	49.573795
1976	49.851335
1977	50.122316
1978	50.52967
1979	50.681774
1980	50.916991
1981	51.293299
1982	51.549625
1983	51.715381
1984	52.143327
1985	52.354877
1986	51.49734
1987	51.806818
1988	52.152849
1989	53.633456
1990	53.868926
1991	54.163289
1992	54.24506
1993	54.868535
1994	55.462705
1995	55.371059
1996	55.810543
1997	56.027108
1998	55.39644
1999	54.944337
2000	54.896098
2001	54.81585
2002	54.662058
2003	54.638975
2004	56.362496
2005	57.525802
2006	58.633694
2007	59.870434
2008	61.030551
2009	62.244591
2010	62.590682
2011	62.410026
2012	62.035255
2013	61.756878
2014	61.882122
2015	63.820809
2016	65.53638
2017	66.987542
2018	67.010529
2019	66.266162
2020	66.890552
2021	63.27246
2022	63.179043