Year	% female
1970	42.50611
1971	42.49813
1972	42.07275
1973	42.37788
1974	42.29857
1975	43.26658
1976	43.74683
1977	43.85315
1978	44.44428
1979	44.56996
1980	44.76087
1981	44.81886
1982	44.77166
1983	45.15897
1984	45.13859
1985	44.97672
1986	44.79844
1987	45.7668
1988	45.78963
1989	44.18027
1990	43.95073
1991	44.20099
1992	43.90824
1993	43.44482
1994	43.43681
1995	43.66681
1996	43.53085
1997	43.28203
1998	42.54385
1999	42.65644
2000	42.28125
2001	42.32288
2002	42.44926
2003	41.95902
2004	42.4775
2005	41.75327
2006	41.37744
2007	41.16129
2008	41.04595
2009	41.06703
2010	41.03376
2011	40.73468
2012	40.80913
2013	41.04542
2014	41.21436
2015	41.5928
2016	41.64218
2017	41.58523
2018	41.61747