Year	% of cohort
1971	44.3311805725098
1972	44.4202919006348
1973	45.2680397033691
1974	47.030158996582
1975	47.1960983276367
1976	47.0595817565918
1977	48.9050483703613
1978	48.2370986938477
1979	48.3448791503906
1980	48.283260345459
1981	48.247989654541
1982	49.1289901733398
1983	50.1017990112305
1984	50.8951110839844
1985	52.7152786254883
1986	53.9546012878418
1987	54.231819152832
1988	54.3242492675781
1989	54.350830078125
1990	55.5233917236328
1991	55.3712501525879
1992	56.8917083740234
1993	57.0724411010742
1994	56.2309303283691
1995	57.3406982421875
1996	56.662971496582
1997	56.3626899719238
1998	56.1898803710938
1999	57.9924201965332
2000	60.1736297607422
2001	63.3502883911133
2002	62.7340316772461
2003	61.1937408447266
2004	61.7321891784668
2005	61.1211585998535
2006	62.4740791320801
2007	61.3904304504395
2008	59.567008972168
2009	57.4391784667969
2010	57.2734184265137
2011	58.1584701538086
2012	54.9750099182129
2013	53.5965690612793
2014	53.976390838623
2015	55.2932281494141
2016	55.6995582580566
2017	58.2342987060547
2018	58.1194305419922
2019	59.0270004272461
2020	60.6474189758301