Year	% female
1971	36.70835
1974	36.48453
1975	36.25729
1976	34.06126
1977	40.44069
1978	41.73228
1979	41.26623
1980	41.39973
1981	43.31498
1982	44.18107
1983	44.25178
1984	45.26114
1985	45.13748
1986	46.2719
1987	46.68552
1988	46.94169
1989	47.19371
1990	47.46719
1991	47.82667
1992	48.17105
1993	48.31613
1994	48.36477
1995	48.54003
1996	48.38255
1997	48.46342
1998	48.65732
1999	48.96134
2000	49.1821
2001	49.54531
2002	49.80537
2003	50.01085
2004	50.10595
2005	50.2922
2006	50.45369
2007	50.55183
2008	50.6189
2009	50.56637
2010	50.33845
2011	50.19496
2012	49.96668
2013	50.1169
2014	50.01973
2015	50.02271
2016	50.05088
2017	50.17608