Year	% of cohort
1960	26.9565
1961	23.249849
1962	23.447207
1963	23.74028
1964	24.008469
1965	24.376425
1966	24.547575
1967	24.869828
1968	25.259963
1969	25.629979
1970	25.991752
1971	26.440951
1972	26.834028
1973	27.14438
1974	27.587028
1975	26.318329
1976	25.972617
1977	26.203048
1978	26.769737
1979	27.228106
1980	27.555676
1981	28.088571
1982	28.385339
1983	26.301326
1984	26.568109
1985	27.054677
1986	27.371311
1987	23.415949
1988	24.596664
1989	24.976455
1990	25.1438
1991	29.016012
1992	26.04318
1993	23.925695
1994	26.516661
1995	34.131985
1996	34.47609
1997	34.715028
1998	31.392628
1999	30.729715
2000	32.511353
2001	32.265519
2002	34.18891
2003	38.358926
2004	39.620626
2005	40.85672
2006	41.551956
2007	43.25483
2008	44.636624
2009	45.946454
2010	46.986003
2011	48.157946
2012	49.37411
2013	50.236514
2014	51.161812
2015	52.005843
2016	52.774308
2017	53.741529
2018	53.916247
2019	54.494128
2020	53.166326
2021	51.280449
2022	52.233344