Year	% female
1970	47.44435
1971	48.15869
1972	48.24262
1973	48.27386
1974	48.89456
1975	51.12196
1976	50.20849
1977	49.44579
1978	49.42156
1979	49.87311
1980	49.80532
1981	49.97269
1982	49.98604
1983	49.97444
1984	50.04422
1985	49.58441
1986	50.23744
1987	50.32991
1988	50.41114
1989	50.4834
1990	50.59874
1991	50.68894
1992	50.79006
1993	50.80644
1994	50.81026
1995	50.85484
1996	50.68172
1997	50.71325
1998	50.6854
1999	50.7266
2000	50.7795
2001	50.84034
2002	50.8818
2003	50.81364
2004	51.02493
2005	51.08059
2006	51.14359
2007	51.09675
2008	51.10594
2009	51.00074
2010	50.8449
2011	50.7431
2012	50.57093
2013	50.43409
2014	50.29717
2015	50.14179
2016	49.96745
2017	49.88277
2018	49.87694