Year	% female
1971	27.80091
1972	27.89739
1976	35.87833
1977	32.83187
1978	34.2435
1979	35.81812
1981	35.41036
1982	38.44947
1983	39.14797
1984	39.79822
1985	39.98392
1986	40.00965
1987	39.83599
1988	41.00648
1989	40.97796
1990	41.53601
1991	42.21038
1992	43.07721
1993	44.36645
1994	44.77279
1995	44.96142
1996	45.76144
1997	46.95926
1998	47.75817
1999	48.39381
2000	48.38964
2001	48.17551
2002	48.76828
2003	49.16747
2004	49.42639
2005	49.99312
2006	49.82595
2007	49.99897
2008	50.31075
2009	50.43236
2010	50.37816
2011	50.59723
2012	50.53434
2013	50.46006
2014	50.62938
2015	50.48446
2016	50.79802
2017	50.90546
2018	50.70468