Year	% female
1970	51.99577
1971	51.90737
1972	51.46606
1973	51.08328
1974	51.87144
1975	51.69506
1976	51.33954
1977	51.61925
1978	51.73158
1979	51.81584
1980	52.15533
1981	52.14616
1982	52.09078
1983	52.18572
1984	52.09546
1985	51.88689
1986	52.05967
1987	51.7645
1988	51.60071
1989	51.26077
1990	50.85884
1999	50.77858
2000	50.54686
2001	50.75155
2002	50.66832
2004	50.7948
2005	50.763
2006	51.03583
2007	50.81897
2008	50.94992
2009	50.98523
2010	50.63763
2011	50.94911
2013	50.68446
2014	50.92779
2015	50.42111
2016	49.78045
2017	50.45662