Year	% female
1971	42.39834
1972	43.22697
1973	44.17793
1974	45.06701
1975	45.43444
1976	45.77373
1977	45.65469
1978	45.6452
1979	45.7761
1980	45.85329
1981	45.86495
1982	45.95256
1983	46.22391
1984	46.60217
1985	46.99527
1986	47.26617
1987	47.38628
1988	47.67717
1989	47.91586
1990	48.38495
1991	49.07215
1992	49.52819
1993	49.36626
1994	49.31412
1995	49.31839
1996	49.28986
1997	49.3507
1998	49.46668
1999	49.60907
2000	49.70617
2001	50.16617
2002	50.0479
2003	50.16613
2004	50.14689
2005	50.61242
2006	50.67939
2007	49.63463
2008	50.21008
2009	49.97787
2010	50.0182
2011	49.42106
2012	50.15789
2013	50.16815
2014	50.14571
2015	49.48672
2016	49.11641
2017	48.91556
2018	48.59136