Year	% female
1973	39.99634
1977	31.94659
1978	28.86038
1979	27.84536
1980	27.30969
1981	27.3551
1982	28.37857
1983	30.28843
1985	31.20589
1986	32.81688
1987	33.08874
1990	36.49213
1991	36.66531
1992	38.43796
1993	39.01262
1994	38.41907
1995	39.08014
1999	38.52172
2000	38.40804
2001	38.7968
2002	39.60317
2004	41.09593
2005	40.84681
2006	41.77796
2007	42.18941
2008	42.84005
2009	44.08045
2010	45.00448
2011	46.44285
2012	47.16092
2013	47.47927
2014	47.61598
2015	47.9285
2017	47.51968