Year	% female
1971	28.8726
1972	30.65358
1973	31.88227
1974	34.55794
1975	34.08417
1976	32.57059
1977	32.99683
1978	34.49864
1979	35.85632
1980	41.60494
1981	43.94766
1982	43.37898
1983	43.96666
1984	46.35564
1985	47.74082
1986	49.56726
1987	52.21403
1988	50.5192
1989	51.4527
1990	52.08066
1991	53.08537
1992	53.40017
1993	53.42342
1994	51.92945
1995	53.56839
1996	53.49782
1997	51.37363
1998	50.60399
1999	49.12504
2000	48.99036
2001	48.8701
2002	48.19034
2003	47.61595
2004	46.88856
2005	46.40952
2006	45.9297
2007	45.98634
2008	45.56075
2009	45.33732
2010	45.16106
2011	44.47422
2012	43.77762
2013	43.26037
2014	42.92178
2015	42.43298
2016	41.6213
2017	41.34715