Year	% female
1970	25.64387
1971	25.96089
1972	26.70441
1973	28.11091
1974	29.7314
1975	29.38025
1976	29.37457
1977	28.52602
1978	28.07435
1979	27.59883
1980	28.37585
1981	28.82569
1982	29.51136
1983	29.7468
1984	30.02842
1985	30.91294
1986	31.24836
1987	31.82778
1988	32.65366
1989	33.03385
1990	33.63415
1991	33.90692
1992	34.23474
1993	34.40036
1994	33.17843
1995	33.45513
1996	34.04582
1997	33.15674
1998	33.99642
1999	34.66318
2000	35.40116
2001	35.52255
2002	35.82387
2003	36.21442
2004	37.20512
2005	37.61847
2006	37.97344
2007	38.4469
2008	38.84515
2009	39.16704
2010	38.37836
2011	38.15881
2012	38.4216
2013	38.38636
2014	38.84765
2015	39.70355
2016	39.96317
2017	39.95432
2018	39.95429