Year	% female
1970	39.45443
1971	39.44092
1972	39.57367
1973	40.12769
1974	40.79016
1975	41.9564
1976	43.19384
1977	44.27401
1978	45.62104
1979	46.41334
1980	47.0697
1981	47.68648
1982	48.32047
1983	49.07357
1984	49.39672
1985	49.85016
1986	50.04671
1987	49.834
1988	49.74344
1989	49.54869
1990	49.53433
1991	49.36901
1992	49.10742
1993	49.17206
1994	49.35085
1995	49.40537
1996	49.45991
1997	49.62751
1998	49.70323
1999	49.8867
2000	49.5147
2001	49.31272
2002	48.97433
2003	48.71953
2004	48.80406
2005	48.87143
2006	49.09881
2007	49.31816
2008	49.34457
2009	49.66846
2010	50.07582
2011	50.45235
2012	50.16171
2013	50.60338
2014	50.77531
2015	50.83528
2016	50.62297
2017	50.31895
2018	50.09162