Year	% female
1970	41.01896
1971	40.98385
1972	41.1317
1973	41.19371
1974	41.16893
1975	41.39593
1976	41.66244
1977	41.87597
1978	42.00588
1979	42.30214
1980	42.43888
1981	42.67587
1982	42.84106
1983	42.92051
1984	43.17805
1985	43.48499
1986	43.73086
1987	43.91459
1988	44.13991
1989	44.01964
1990	44.17599
1991	44.5697
1992	44.7981
1993	45.12416
1994	45.22045
1995	45.23408
1996	45.23303
1997	45.46226
1998	45.50294
1999	45.67033
2000	45.73915
2001	45.91821
2002	46.1247
2003	47.21788
2004	47.26846
2005	47.33785
2006	47.44952
2007	47.55301
2008	47.88156
2009	48.00522
2010	48.10022
2011	48.17779
2012	48.18248
2013	48.93784
2014	48.85471
2015	48.89737
2016	49.3457
2017	49.24976
2018	49.19061