Year	% female
1970	42.50842
1971	43.27333
1972	43.69895
1973	44.33517
1974	45.49776
1975	46.35798
1976	46.8415
1977	47.07542
1978	47.23031
1979	47.58153
1980	47.9455
1981	48.23462
1982	48.40088
1983	48.37556
1984	48.5889
1985	48.73901
1986	48.61127
1987	48.66012
1988	48.90766
1989	48.82464
1990	48.9042
1991	49.02326
1992	49.01541
1993	49.20856
1994	49.38324
1995	49.32926
1998	49.26377
1999	49.02589
2000	49.38302
2001	49.24492
2002	48.44374
2003	48.52072
2004	48.2832
2005	48.71799
2006	49.02563
2007	49.35788
2008	49.19819
2009	49.16483
2012	49.84886
2014	49.78284
2015	49.57786
2016	49.67015