Year	% female
1971	27.27235
1972	27.62446
1973	28.44661
1974	29.20492
1976	31.60844
1977	32.52443
1978	32.76693
1979	33.55221
1980	34.03441
1981	35.08127
1982	35.84584
1983	36.5647
1984	37.05971
1986	37.11168
1987	37.28958
1988	37.52021
1989	37.78746
1990	38.24102
1991	38.49934
1992	38.94386
1993	39.23433
1994	39.43267
1995	39.57065
1997	40.2029
1999	42.38031
2000	44.04297
2001	43.9427
2002	44.28605
2003	44.47151
2004	45.8469
2005	46.20383
2006	46.47666
2007	46.69872
2008	47.302
2009	48.12649
2010	48.34925
2011	48.46615
2012	48.97081
2013	49.144
2014	49.30484
2015	49.11698
2016	49.02541
2017	48.67995