Year	% female
1971	36.31906
1972	37.39459
1973	38.36333
1974	39.02652
1975	39.21292
1976	39.63589
1977	40.12523
1978	40.58048
1979	41.10336
1980	42.31615
1981	42.91863
1982	43.71375
1983	44.21967
1984	44.8377
1985	45.36721
1986	45.85885
1987	46.2968
1988	46.38752
1989	46.43756
1990	46.4779
1991	46.49637
1992	46.50155
1993	46.6406
1994	46.66025
1995	46.66996
1996	46.64604
1997	46.71837
1998	47.02024
1999	46.83908
2000	46.99671
2001	47.19715
2002	47.23981
2003	47.5393
2004	47.58615
2005	47.76513
2006	47.83757
2007	47.8428
2008	47.9095
2009	47.93169
2010	47.91126
2011	48.0219
2012	48.00448
2013	48.09031