Year	% female
1971	44.11718
1972	44.05983
1973	44.86794
1974	44.84302
1975	45.43092
1976	46.02848
1977	46.61546
1978	47.15067
1979	47.50811
1980	48.11449
1981	48.44543
1982	48.58638
1983	48.88188
1984	49.00353
1985	49.14287
1986	49.39142
1987	49.67835
1988	49.77106
1989	49.88392
1990	50.06276
1991	50.18331
1992	49.81735
1997	50.23745
1998	49.96864
1999	49.96116
2000	49.57843
2001	50.00319
2002	50.25924
2003	50.47175
2004	50.80669
2005	50.89962
2006	51.27345
2007	50.85402
2008	50.86807
2009	50.79848
2010	50.744
2011	50.87
2012	50.70377
2013	50.74
2014	50.75036
2015	50.46462
2016	50.07703
2017	49.89549
2018	49.70078