Year	% female
1970	45.48778
1971	47.08535
1972	46.44892
1973	48.78164
1974	51.23724
1975	51.92496
1976	53.30876
1977	54.48704
1978	53.22759
1979	54.19695
1980	54.52811
1981	55.43942
1983	54.2543
1984	53.41402
1985	53.01848
1986	52.23982
1987	51.03371
1988	50.80328
1989	51.8134
1990	52.52643
1991	53.93472
1992	53.53667
1993	53.07198
1994	52.20113
1995	52.22524
1998	51.84043
1999	51.44356
2000	51.37699
2001	50.98192
2002	51.16654
2003	51.08713
2004	50.84787
2005	50.49906
2006	51.06782
2007	51.08853
2008	51.90168