Year	% female
1971	32.17011
1972	32.69591
1973	33.14663
1974	33.62592
1975	33.19639
1976	34.2313
1977	35.02295
1978	35.25695
1979	35.97728
1980	36.11225
1981	36.92188
1982	37.50689
1983	38.0119
1984	38.46641
1985	38.96682
1986	39.56642
1987	40.08433
1988	40.80188
1989	41.34788
1990	42.49955
1991	43.23911
1992	44.58165
1993	44.75581
1994	44.45552
1995	45.51593
1996	45.47239
1997	45.38059
1999	46.74515
2000	47.05282
2001	47.26582
2003	47.29688
2004	47.38814
2009	48.51815
2010	48.05861
2011	48.46033
2012	48.3476
2013	48.18927
2014	48.56597
2016	48.18645
2017	48.14735
2018	48.222