Year	% female
1971	39.45844
1972	40.14976
1973	40.60075
1974	40.81548
1975	41.38
1976	42.10313
1977	42.62266
1978	43.23364
1979	44.09083
1980	45.07907
1981	45.8693
1982	46.2405
1983	46.34632
1984	46.56535
1985	46.79225
1986	46.80443
1987	47.00781
1988	46.53728
1989	46.4698
1990	46.49774
1991	46.55132
1992	46.64595
1993	46.92216
1994	47.0201
1995	47.29456
1996	47.26296
1997	47.51345
1998	47.48595
1999	47.61122
2000	47.58023
2001	47.47943
2002	47.34487
2003	47.30884
2004	47.29207
2005	47.26635
2006	47.06991
2007	46.99308
2008	47.08865
2009	47.21343
2010	47.38369
2011	47.54309
2012	47.80231
2013	48.00525
2014	48.18849
2015	48.29446
2016	48.36884
2017	48.46205