Year	% female
1970	42.72961
1971	42.70775
1972	42.68071
1973	42.88885
1974	42.62223
1975	43.47562
1976	43.80239
1977	44.03923
1978	44.32085
1979	44.0083
1980	44.98941
1981	47.52798
1982	44.96541
1983	45.73413
1984	45.52308
1985	45.75936
1986	46.19759
1987	46.14311
1988	46.20174
1989	46.14392
1990	45.77217
1991	45.86179
1992	46.22879
1993	46.29228
1994	45.57593
1995	45.56884
1996	45.74448
1997	45.56745
1998	44.13165
1999	44.25401
2000	45.14815
2001	45.37676
2002	45.28096
2003	45.21797
2004	43.75203
2005	43.93755
2006	43.49924
2007	43.54469
2008	43.50152
2009	42.7898
2010	42.95827
2011	42.84517
2012	42.76873
2013	42.83162
2014	42.5812
2015	42.34748
2016	42.21017
2017	41.88471
2018	41.89468