Year	% female
1971	29.1201
1972	29.20284
1973	29.17783
1974	29.40323
1975	28.80945
1976	28.67888
1977	29.78795
1978	29.5249
1979	29.64353
1980	29.99261
1981	31.75931
1982	32.66686
1983	34.2447
1984	34.45727
1985	35.39628
1986	35.82576
1987	37.14108
1988	38.18031
1989	38.62559
1991	38.95293
1993	38.93969
1996	39.13562
1999	39.14667
2000	38.31117
2001	37.72741
2003	41.08481
2004	39.51115
2007	42.50753