Year	% female
1970	35.33441
1971	35.38584
1972	35.50044
1973	35.78953
1974	36.13805
1975	36.44529
1976	36.70037
1977	36.69908
1978	36.90726
1979	37.01117
1980	37.04465
1981	37.07088
1982	36.89638
1983	37.90651
1984	36.97701
1985	37.54133
1986	38.23015
1987	38.58013
1988	38.88772
1989	39.21339
1990	39.52112
1991	39.90585
1992	40.26392
1993	40.54631
1994	41.10367
1995	41.35215
1996	41.65188
1997	42.32425
1998	42.99075
1999	43.63122
2000	43.81781
2001	44.01868
2002	44.45192
2003	45.46365
2004	45.31233
2005	45.54878
2006	45.74046
2007	45.99066
2008	46.3982
2009	46.97038
2010	47.06701
2011	47.22738
2012	47.4044
2013	48.05546
2014	48.20784
2015	48.25005
2016	48.35996
2017	48.46247
2018	48.56316