Year	% female
1970	38.34202
1971	38.26689
1972	38.47023
1973	38.73511
1974	38.9779
1975	39.23498
1976	39.46387
1977	39.82981
1978	40.20381
1979	41.06845
1980	41.54071
1981	41.96477
1982	42.2782
1983	42.45673
1984	42.66045
1985	42.95226
1986	43.23915
1987	43.51908
1988	43.47907
1989	43.84071
1990	44.02663
1991	44.02908
1992	44.31339
1993	44.45392
1994	44.49175
1995	44.79256
1996	44.0141
1997	44.91392
1998	45.13929
1999	45.36764
2000	45.60187
2001	45.87117
2002	46.08229
2003	46.26445
2004	46.37607
2005	46.46548
2006	46.49166
2007	46.54886
2008	46.70943
2009	46.81984
2010	46.91553
2011	46.78595
2012	47.08889
2013	47.12151
2014	47.26801
2015	47.34594
2016	47.36851
2017	47.45282
2018	47.47494