Year	% of cohort
1960	21.965945
1961	22.40484
1962	22.853018
1963	23.215235
1964	23.637099
1965	24.573117
1966	25.366947
1967	26.282774
1968	26.927409
1969	27.573284
1970	28.162967
1971	28.893391
1972	29.681114
1973	30.556024
1974	27.849578
1975	18.601097
1976	20.288498
1977	18.142938
1978	14.678696
1979	15.664677
1980	24.475542
1981	26.193157
1982	28.168483
1983	29.384913
1984	32.819552
1985	32.671892
1986	33.478908
1987	35.536556
1988	35.464003
1989	38.401452
1990	38.807469
1991	38.979027
1992	40.748246
1993	42.104225
1994	43.496758
1995	43.288994
1996	44.510709
1997	45.718723
1998	45.205102
1999	42.302258
2000	58.491119
2001	59.787958
2002	61.06191
2003	62.240404
2004	63.533748
2005	64.622862
2006	65.811396
2007	66.90833
2008	67.941897
2009	68.786484
2010	69.515819
2011	70.157705
2012	70.852459
2013	71.525943
2014	72.139481
2015	72.697726
2016	73.174166
2017	73.641856
2018	74.087229
2019	74.513294
2020	75.026269
2021	73.591564
2022	75.841025