Year	% female
1970	50.3
1971	50.37
1972	50.42
1973	50.45
1974	50.5711
1975	50.47
1976	50.37001
1977	50.28
1978	50.28451
1979	50.20441
1980	49.98561
1981	50.00429
1982	49.83636
1983	49.8135
1984	49.56334
1985	49.98858
1986	49.98999
1987	49.56335
1988	49.56335
1989	49.56336
1990	52.59119
1991	49.55479
1992	50.42858
1993	49.60582
1994	48.89374
1995	48.86292
1996	48.94359
1998	48.33893
1999	49.01096
2000	48.91316
2001	48.75917
2002	48.76026
2004	48.66881
2005	48.48683
2006	48.61429
2007	48.7733
2008	48.83549
2009	48.86041
2010	48.50103
2011	48.07808
2012	48.0962
2013	48.26944
2014	48.09721
2015	48.11949
2016	48.20983
2017	48.09866
2018	48.13149