Year	% female
1971	28.98527
1972	28.78221
1973	29.36885
1974	30.16014
1975	32.37681
1976	33.30976
1977	35.46898
1978	37.34671
1979	43.04002
1980	45.01369
1981	46.36352
1982	47.00179
1983	46.44751
1984	45.69353
1985	44.87756
1986	44.75274
1987	44.62195
1988	45.13184
1989	44.15312
1991	44.46523
1992	44.87728
1993	44.69189
1996	44.8308
1999	43.97153
2000	43.98716
2003	44.4708
2004	44.3039
2007	44.35222