Year	% female
1970	44.24577
1971	44.50422
1972	44.52178
1973	45.25213
1974	45.85677
1975	46.69362
1976	47.38991
1977	48.06242
1978	48.73454
1979	48.78125
1980	48.92588
1981	49.12266
1982	49.03304
1983	49.11963
1984	49.0661
1985	49.04208
1986	49.16718
1987	49.23228
1988	49.16976
1989	49.10198
1990	49.07648
1991	49.21801
1992	49.22785
1993	49.15238
1994	48.96977
1995	49.13455
1996	49.0759
1997	49.17632
1998	49.28186
1999	49.17512
2000	48.99722
2001	48.97715
2002	48.78294
2003	48.83247
2004	48.87077
2005	48.74053
2006	48.60673
2007	48.6865
2008	48.5721
2009	48.62335
2010	48.56368
2011	48.49676
2012	48.51415
2013	48.65181
2014	48.72777
2015	48.70785
2016	48.58696
2017	48.57116
2018	48.56998