Year	% female
1970	46.71978
1971	47.21615
1972	47.31776
1973	47.77506
1974	48.28355
1975	48.65325
1976	48.67821
1977	49.01932
1978	48.86935
1979	48.82509
1980	48.66699
1981	48.61574
1982	48.71334
1983	48.85535
1984	48.81958
1985	48.85603
1986	48.73242
1987	48.87095
1988	48.84583
1989	48.79172
1990	48.69597
1991	48.76738
1992	49.57102
1993	49.49529
1994	49.64486
1995	49.45536
1996	49.45643
1997	49.41116
1998	49.4727
1999	49.88216
2000	50.29566
2001	49.76664
2002	49.84224
2003	49.78645
2004	49.83094
2005	49.83877
2006	49.91359
2007	49.57748
2008	49.70884
2009	50.16827
2010	49.74643
2011	49.71083
2012	50.0341
2013	50.03714
2014	50.12713
2015	50.00756
2016	49.98371
2017	49.97551
2018	49.96846