Year	% female
1970	41.38261
1971	41.57421
1972	41.90111
1973	42.16471
1974	42.51754
1975	42.66412
1976	42.72112
1977	43.21481
1978	43.59039
1979	43.71563
1980	44.05189
1981	44.33207
1982	44.34726
1983	44.29807
1984	44.44335
1985	44.53752
1986	44.70826
1987	45.05268
1988	44.4991
1989	45.29737
1990	45.00204
1991	45.22191
1992	45.37714
1993	45.35831
1994	45.40552
1995	45.24954
1996	45.34332
1997	45.32695
1998	45.24479
1999	45.49009
2000	45.60607
2001	45.81715
2002	45.80167
2003	46.01811
2004	46.23589
2005	46.48738
2006	46.81786
2007	47.07078
2008	47.2544
2009	47.46392
2010	47.61007
2011	47.54994
2012	47.90239
2013	48.08163
2014	48.22871
2015	48.37864
2016	48.35277
2017	48.3773
2018	48.3656