Year	% female
1971	32.92455
1972	33.58768
1973	36.18915
1974	37.32837
1975	37.73144
1976	38.61586
1977	39.0481
1978	38.87116
1979	39.37317
1980	39.32911
1981	39.43681
1982	38.4675
1983	39.20719
1984	40.04541
1985	40.965
1986	41.83932
1987	42.75768
1988	44.06053
1989	44.45716
1990	44.58989
1991	45.62455
1992	44.96838
1993	44.9873
1995	44.38575
1996	45.78616
1997	45.64845
1998	44.87667
1999	44.12862
2000	44.4239
2001	44.39636
2002	43.94968
2003	44.60043
2004	45.42927
2005	46.18526
2006	47.65087
2007	48.17929
2008	48.7271
2009	49.16094
2010	49.67006
2011	50.10443
2012	50.30235
2013	50.36854
2014	50.67554
2015	50.58145
2016	50.40497
2017	50.19921
2018	50.11885