Year	% female
1971	38.4809
1972	40.9771
1974	40.74992
1975	40.50299
1976	39.44641
1977	43.93464
1978	45.22144
1979	44.53207
1980	44.73983
1981	46.69996
1982	47.05282
1983	47.06361
1984	47.61204
1985	47.12839
1986	48.30115
1987	48.60866
1988	48.84461
1989	49.2493
1990	49.43689
1991	49.66026
1992	48.84902
1993	49.35781
1994	49.61571
1995	49.67996
1996	49.44512
1997	49.36444
1998	49.60433
1999	49.94828
2000	50.22319
2001	50.51124
2002	50.89446
2003	51.45495
2004	51.18485
2005	51.18297
2006	51.28009
2007	51.31241
2008	51.39835
2009	51.46451
2010	51.27854
2011	51.11628
2012	51.02037
2013	50.80433
2014	50.79245
2015	50.99047
2016	51.14729
2017	51.0881