Year	% female
1970	47.05667
1971	47.82694
1972	47.87023
1973	47.88886
1974	48.5941
1975	50.99538
1976	50.10663
1977	49.36981
1978	49.32599
1979	49.80606
1980	49.71693
1981	49.88634
1982	49.92102
1983	49.94012
1984	50.02559
1985	49.54803
1986	50.22054
1987	50.31873
1988	50.41294
1989	50.49114
1990	50.60071
1991	50.73052
1992	50.82409
1993	50.81445
1994	50.80613
1995	50.84639
1996	50.66278
1997	50.70712
1998	50.68381
1999	50.72723
2000	50.78817
2001	50.85312
2002	50.89975
2003	50.81431
2004	51.02369
2005	51.07765
2006	51.14025
2007	51.11357
2008	51.1078
2009	51.00299
2010	50.84202
2011	50.7382
2012	50.56199
2013	50.43571
2014	50.29223
2015	50.13692
2016	49.96316
2017	49.87051
2018	49.86319