Year	% female
1971	30.17952
1972	32.21477
1973	32.77655
1974	33.87164
1975	39.93741
1976	36.37747
1977	38.45436
1978	40.01573
1979	39.96756
1980	41.29766
1981	42.0142
1982	42.0544
1983	42.4698
1984	43.06113
1985	43.38307
1986	43.79132
1987	44.71495
1988	44.79983
1989	46.35837
1995	46.33969
1996	48.57041
1997	47.41807
1999	47.24192
2011	51.65457