Year	% female
1970	38.13054
1971	38.26871
1972	38.88758
1973	38.98641
1974	39.03343
1975	39.26029
1976	39.49306
1977	40.26324
1978	41.07679
1979	41.28573
1980	41.67817
1981	42.26445
1982	42.69335
1983	42.21361
1984	42.65834
1985	42.71993
1986	42.87702
1987	43.02797
1988	43.08132
1989	43.52392
1990	43.42601
1991	43.75263
1992	43.96399
1993	44.02362
1994	44.1864
1995	44.12029
1996	44.25188
1997	44.38277
1998	44.44245
1999	44.73037
2000	44.97555
2001	45.19627
2002	45.23038
2003	45.58755
2004	45.57636
2005	46.09993
2006	46.49454
2007	46.82589
2008	46.99704
2009	47.19883
2010	47.3944
2011	47.58406
2012	47.82176
2013	47.88029
2014	47.89132
2015	47.99444
2016	47.92129
2017	47.95369
2018	47.87596