Year	% of cohort
1960	37.728184
1961	37.845871
1962	38.241765
1963	38.388484
1964	38.962635
1965	39.165617
1966	39.720223
1967	40.329533
1968	40.961029
1969	41.290368
1970	42.073842
1971	42.776558
1972	43.470905
1973	44.141188
1974	44.793624
1975	45.623207
1976	46.771328
1977	47.231886
1978	48.0344
1979	48.751176
1980	49.542767
1981	50.699178
1982	51.703358
1983	52.195664
1984	53.175216
1985	53.924811
1986	54.27444
1987	54.983604
1988	55.36116
1989	55.265182
1990	54.624237
1991	54.174393
1992	53.663174
1993	53.177377
1994	52.726879
1995	52.583028
1996	52.373093
1997	52.436809
1998	52.025612
1999	52.156952
2000	52.513256
2001	52.139339
2002	52.755625
2003	53.074389
2004	52.333285
2005	52.87105
2006	52.859746
2007	53.339567
2008	53.07323
2009	53.819251
2010	53.783982
2011	54.852987
2012	54.913591
2013	56.15432
2014	56.344759
2015	57.431544
2016	57.598879
2017	58.896776
2018	59.08576
2019	60.537427
2020	60.671747
2021	62.146631
2022	61.814602