Year	% female
1970	47.03552
1971	45.76488
1972	47.04187
1973	47.85865
1974	49.99302
1975	49.09794
1977	49.02103
1980	52.27261
1982	52.46196
1983	52.84603
1984	56.78984
1985	64.63734
1986	63.22036
1987	62.73722
1988	63.15908
1989	61.7739
1990	57.9222
1991	53.84985
1992	53.21181
1993	52.53746
1994	52.69984
1995	53.70372
1996	53.55726
1997	53.70067
1999	53.59027
2000	53.26078
2001	53.27864
2002	53.15429
2004	52.5806
2005	52.54254
2006	52.49578
2007	52.37617
2008	52.45822
2010	51.58546