Year	% female
1975	25.97941
1976	27.23703
1977	27.51851
1978	27.86768
1979	28.3245
1981	30.64557
1982	32.99906
1986	34.44063
1990	36.35956
1992	36.97291
1994	38.03367
1997	39.20752
2004	44.42734
2007	44.88202