Year	% female
1971	24.25625
1973	24.55534
1974	24.99583
1975	26.56605
1976	26.97189
1977	29.42597
1978	32.34054
1979	29.63832
1980	29.20582
1981	29.54334
1983	30.46523
1984	30.50589
1985	30.17659
1986	29.8153
1987	30.54825
1988	29.80912
1989	29.35875
1990	32.23663
1991	33.05392
1992	34.53135
1993	34.76031
1994	35.39823
1995	35.54345
1996	38.48958
2008	48.29718
2009	48.99042
2010	48.78092