Year	% female
1971	43.23313
1972	43.30739
1973	45.53382
1974	45.80882
1975	47.66737
1976	48.00959
1977	48.45847
1978	48.68611
1979	47.68525
1980	49.71216
1981	49.76952
1982	48.81295
1983	50.41553
1984	49.80755
1985	49.86599
1986	50.59735
1987	50.68035
1988	50.58191
1989	50.49629
1990	50.21162
1991	50.39703
1992	50.69799
1993	50.81528
1994	50.83135
1995	50.79795
1996	51.29437
1997	50.21801
1998	50.42472
1999	50.33286
2000	50.19313
2001	50.03971
2002	50.22127
2003	50.01405
2004	50.16459
2005	50.11674
2006	50.09906
2007	50.1603
2008	50.01618
2009	49.68341
2010	49.13222
2011	48.88781
2012	48.83255
2013	48.7686
2014	48.75095
2015	48.55977
2016	48.7454
2017	48.99069