Year	% female
1971	28.51261
1972	28.79445
1973	29.57975
1974	30.46807
1976	31.47197
1977	31.51515
1978	31.49517
1979	32.22939
1980	32.48058
1982	34.32304
1983	34.82285
1984	35.10456
1986	35.21368
1987	35.54596
1988	35.97043
1989	36.50062
1990	36.99364
1991	37.44795
1992	37.99216
1993	38.4487
1994	39.23948
1995	38.98477
1997	39.92676
1999	40.04685
2000	41.49765
2001	41.51274
2002	41.42476
2003	41.51017
2004	42.92518
2005	44.74863
2006	44.97135
2007	45.2718
2008	46.14099
2009	46.93382
2010	47.01785
2011	47.03763
2012	47.82478
2013	48.31819
2014	48.41458
2015	48.40957
2016	48.43019
2017	47.79338