Year	% female
1970	41.37962
1971	41.57121
1972	41.89828
1973	42.16189
1974	42.51493
1975	42.66152
1976	42.71907
1977	43.21295
1978	43.58881
1979	43.71438
1980	44.05089
1981	44.33125
1982	44.34648
1983	44.29725
1984	44.44252
1985	44.53669
1986	44.70748
1987	45.05191
1988	44.49826
1989	45.2968
1990	45.0014
1991	45.22133
1992	45.37665
1993	45.35786
1994	45.40499
1995	45.249
1996	45.34277
1997	45.32649
1998	45.24433
1999	45.48965
2000	45.60566
2001	45.81682
2002	45.80138
2003	46.01787
2004	46.23569
2005	46.48724
2006	46.81772
2007	47.07062
2008	47.25425
2009	47.46379
2010	47.60994
2011	47.54979
2012	47.90228
2013	48.08156
2014	48.22866
2015	48.37857
2016	48.3527
2017	48.37721
2018	48.3655