Year	% female
1970	39.53977
1971	39.59136
1972	39.97263
1973	40.1483
1974	40.45369
1975	40.58113
1976	40.76936
1977	41.15908
1978	41.67738
1979	41.84029
1980	42.20387
1981	42.46341
1982	43.30766
1983	43.45885
1984	43.67886
1985	43.39361
1986	43.59091
1987	44.08206
1988	43.80662
1989	43.95542
1990	44.04922
1991	44.25582
1992	44.36979
1993	44.4349
1994	44.47141
1995	44.00944
1996	43.82776
1997	44.01956
1998	44.08747
1999	44.71782
2000	44.99248
2001	45.1456
2002	45.18067
2003	45.46474
2004	45.39478
2005	46.10022
2006	46.49501
2007	46.63612
2008	46.89412
2009	47.21176
2010	47.41034
2011	47.55332
2012	47.67172
2013	47.78038
2014	47.811
2015	48.0141
2016	48.10503
2017	48.1499
2018	48.13873