Year	% female
1971	18.61277
1972	20.04236
1973	26.98844
1974	36.40609
1975	38.65713
1976	37.61113
1977	39.26665
1978	42.78882
1979	43.24964
1980	44.77151
1981	45.24421
1982	46.48551
1983	46.70277
1984	47.06594
1985	48.11674
1986	48.60275
1987	49.17259
1988	49.65243
1989	50.15083
1990	50.48379
1991	50.73239
1992	51.02034
1993	51.1151
1994	50.97431
1995	50.67297
1997	50.43363
1998	50.6529
2016	48.86481
2017	46.78938