Year	% of cohort
1960	30.820744
1961	31.458375
1962	32.075833
1963	32.67009
1964	33.375657
1965	33.847707
1966	34.428335
1967	35.175126
1968	35.770135
1969	36.495926
1970	37.415267
1971	37.82878
1972	38.643793
1973	39.332978
1974	39.873115
1975	40.322498
1976	40.61865
1977	40.804624
1978	40.920345
1979	41.035775
1980	41.056524
1981	40.991862
1982	40.911195
1983	40.838586
1984	40.810906
1985	40.890352
1986	41.078966
1987	41.444151
1988	41.878823
1989	42.582795
1990	43.294667
1991	44.220897
1992	45.206878
1993	46.5009
1994	47.111469
1995	47.569144
1996	48.158977
1997	49.667423
1998	50.893073
1999	51.90306
2000	52.976096
2001	54.086291
2002	54.27337
2003	55.02006
2004	55.497899
2005	56.194415
2006	57.263696
2007	57.482951
2008	58.186216
2009	58.939871
2010	58.949916
2011	59.642505
2012	59.600026
2013	59.68691
2014	60.429106
2015	60.63814
2016	61.583473
2017	61.632332
2018	61.831959
2019	62.625048
2020	60.708496
2021	59.070234
2022	60.287815