Year	% of cohort
1960	31.494859
1961	32.062691
1962	31.727134
1963	31.213186
1964	32.695661
1965	33.263683
1966	34.167091
1967	35.099404
1968	35.958278
1969	37.829367
1970	39.01484
1971	39.795236
1972	41.003806
1973	41.90313
1974	43.046392
1975	44.090087
1976	45.473814
1977	46.421395
1978	47.681884
1979	48.976617
1980	50.603939
1981	51.824324
1982	52.287606
1983	54.826972
1984	56.135124
1985	56.806314
1986	57.203469
1987	58.649816
1988	59.667742
1989	60.176315
1990	60.785336
1991	61.556511
1992	61.896853
1993	62.510649
1994	62.674315
1995	63.410917
1996	63.555896
1997	64.516551
1998	64.879786
1999	65.926078
2000	66.936779
2001	67.902214
2002	69.012095
2003	70.076854
2004	70.468262
2005	71.371402
2006	72.390456
2007	73.304573
2008	73.662516
2009	74.408732
2010	74.487918
2011	74.663484
2012	74.522002
2013	74.731151
2014	74.572377
2015	73.590847
2016	73.651982
2017	73.66868
2018	73.003868
2019	73.070303
2020	71.396379
2021	69.979677
2022	70.121725