Year	% of cohort
1960	20.08382
1961	20.072941
1962	20.299308
1963	21.967148
1964	26.587579
1965	21.989704
1966	18.243654
1967	18.472674
1968	18.55873
1969	17.716805
1970	17.896148
1971	23.258187
1972	23.470613
1973	27.68599
1974	27.126727
1975	27.407549
1976	27.201578
1977	28.029686
1978	28.720841
1979	29.02745
1980	29.948275
1981	30.58981
1982	31.292468
1983	26.188025
1984	22.132764
1985	22.860554
1986	23.456705
1987	8.404537
1988	3.807794
1989	17.751327
1990	18.083925
1991	18.336607
1992	9.034851
1993	8.928837
1994	39.188536
1995	18.95637
1996	19.153412
1997	20.249987
1998	5.790688
1999	35.700359
2000	39.698998
2001	40.714812
2002	41.263896
2003	45.223098
2004	45.900331
2005	46.564754
2006	47.001018
2007	48.512666
2008	49.42662
2009	50.013063
2010	51.228823
2011	51.872676
2012	53.202816
2013	53.080695
2014	52.977773
2015	53.179594
2016	53.270841
2017	53.087637
2018	53.483942
2019	53.388182
2020	52.625195
2021	51.477459
2022	52.328355