Year	% female
1971	49.00001
1972	48.99998
1973	49.00006
1974	48.99995
1975	49
1976	48.99993
1977	48.99999
1978	48.99995
1979	48.99993
1981	48.99997
1982	49.00006
1983	49
1984	47.99996
1985	48.00006
1986	47.99995
1987	47.99997
1988	47.99995
1989	48.8747
1990	48.83849
1991	48.88937
1992	52.59556
1993	48.99858
1994	48.78261
1995	48.67367
1996	48.49161
1997	48.67981
1998	48.63479
1999	48.50369
2000	48.56083
2001	48.44358
2002	48.3533
2003	48.28259
2004	48.33728
2005	48.31444
2006	48.43841
2007	48.45599
2008	48.44846
2009	48.50441
2010	48.52716
2011	48.52618
2012	48.63755
2013	48.68389
2014	48.68149
2015	48.77199
2016	48.81775
2017	48.82027