Year	% female
1971	31.83139
1972	32.77051
1973	33.42778
1974	33.5698
1975	34.36518
1976	34.43993
1977	36.93951
1978	36.52028
1979	37.88253
1980	39.06191
1981	38.88707
1982	39.30387
1983	39.82521
1984	40.10137
1985	40.83352
1986	41.74593
1987	41.65457
1988	42.17228
1989	42.5475
1990	42.82478
1991	43.34901
1992	43.5179
1993	44.91052
1994	45.46543
2001	44.89301
2003	44.98322
2004	44.47362
2009	46.4782
2011	45.51312
2012	43.02311
2013	42.29818
2014	42.56964
2016	41.31476
2017	40.96756
2018	41.03443