Year	% female
1970	41.25387
1971	44.4898
1972	44.32863
1973	44.15863
1974	47.90914
1975	46.89214
1976	49.34326
1977	51.25
1978	38.74092
1979	44.71806
1980	43.53253
1981	53.09168
1983	52.35678
1984	47.88016
1985	50.05035
1986	49.26608
1987	43.80766
1988	50.24759
1989	47.27838
1990	43.3641
1991	51.60186
1992	51.14827
1993	46.40917
1994	43.60757
1995	38.7837
1998	37.35788
1999	35.70611
2000	37.82122
2001	38.36795
2002	38.11799
2003	38.18378
2004	37.66306
2005	34.32103
2006	39.3906
2007	37.53715