Year	% female
1975	40.92506
1976	40.85305
1977	41.48238
1978	42.47582
1979	42.38161
1980	41.98152
1981	41.15276
1982	40.97934
1983	41.4487
1984	41.67129
1985	42.05521
1986	41.93982
1987	42.66519
1988	42.7717
1989	43.06291
1990	43.07692
1991	43.29891
1992	43.8482
1993	44.11216
1994	45.15844
1995	45.62932
1996	46.02549
1997	46.20321
1998	46.67052
1999	47.09739
2000	47.27042
2001	47.34528
2002	47.42087
2003	47.48883
2004	47.7539
2005	47.97621
2006	48.14483
2007	48.19287
2008	48.23949
2009	48.34576
2010	47.80781
2011	47.82301
2012	47.93228
2013	47.82754
2014	47.9515
2015	47.90167
2016	47.94401
2017	47.89156
2018	47.87101