Year	% female
1975	40.59746
1976	40.57869
1977	41.27389
1978	42.30878
1979	42.19781
1980	41.75746
1981	40.8779
1982	40.66151
1983	41.13431
1984	41.36651
1985	41.78414
1986	41.68425
1987	42.45762
1988	42.58269
1989	42.89271
1990	42.91459
1991	43.15342
1992	43.72347
1993	43.99738
1994	45.06733
1995	45.55089
1996	45.95864
1997	46.14286
1998	46.62245
1999	47.05903
2000	47.23662
2001	47.31434
2002	47.39241
2003	47.46261
2004	47.73246
2005	47.95813
2006	48.12933
2007	48.17829
2008	48.22552
2009	48.33347
2010	47.78727
2011	47.80276
2012	47.9136
2013	47.80741
2014	47.93301
2015	47.88236
2016	47.9252
2017	47.87242
2018	47.85229