Year	% female
1970	12.0055
1971	17.7435
1972	21.49697
1975	7.12885
1976	6.73985
1977	7.60624
1978	8.89648
1979	32.43986
1980	16.33066
1981	15.60174
1982	16.31318
1983	19.72332
1984	21.97007
1985	21.83734
1986	24.22562
1987	25.79619
1988	23.83462
1989	24.59794
1990	24.47254
1991	24.09338
1992	24.65992
1993	24.5652
1994	30.20333
1995	29.75939
2007	36.2761
2008	35.21372
2009	35.13342