Year	% female
1970	38.60424
1971	38.59944
1972	39.26058
1973	39.12919
1974	39.03379
1975	39.24302
1976	39.46147
1977	40.32089
1978	40.73506
1979	40.91032
1980	41.25
1981	41.95582
1982	42.59897
1983	42.03588
1984	42.71683
1985	42.55111
1986	42.7322
1987	43.03637
1988	43.49024
1989	43.67958
1990	43.91648
1991	44.24207
1992	44.40697
1993	44.53409
1994	44.68337
1995	44.46717
1996	44.47666
1997	44.6614
1998	44.8229
1999	45.33316
2000	45.56635
2001	45.76938
2002	45.87406
2003	46.13622
2004	46.11252
2005	46.71675
2006	47.06556
2007	47.22808
2008	47.39929
2009	47.61636
2010	47.84414
2011	47.95214
2012	48.02806
2013	48.10278
2014	48.1426
2015	48.32526
2016	48.38676
2017	48.38548
2018	48.37032