Year	% female
1971	26.52105
1972	28.66566
1973	34.70239
1977	30.74508
1978	34.46548
1979	35.9803
1980	37.98603
1981	38.39848
1982	38.78793
1983	35.32155
1984	39.74317
1985	40.43413
1986	42.21632
1988	42.09909
1990	39.80467
1991	38.23439
1992	38.93399
1993	38.36709
1994	38.93703
1995	39.45491
1996	39.48707
1997	39.50044
1998	40.18111
1999	40.31886
2000	40.6155
2001	41.09998
2002	41.51514
2003	41.88752
2004	42.32867
2005	42.55007
2006	43.14882
2007	43.43101
2008	43.88876
2009	44.27363
2010	44.68457
2011	45.2011
2012	45.73903
2013	46.22623
2014	46.84544
2015	47.18746
2016	47.29356
2017	47.42405
2018	47.59531