Year	% female
1970	41.39921
1971	41.34285
1972	41.23497
1973	41.37771
1974	41.38224
1975	41.08028
1976	40.79399
1977	40.61451
1978	40.63338
1979	40.25387
1980	39.92231
1981	40.0192
1982	40.03538
1983	38.64913
1984	37.92135
1985	39.99904
1986	42.16065
1987	42.79346
1988	42.84877
1989	43.01322
1990	43.46273
1991	43.81561
1992	44.14679
1993	44.39354
1994	44.58592
1995	45.21945
1996	45.42287
1997	45.55053
1998	45.51375
1999	45.55197
2000	45.04058
2001	44.82617
2002	44.11754
2003	44.30995
2004	44.13261
2005	44.30218
2006	44.15542
2007	43.85464
2008	44.48818
2009	44.90145
2010	45.29525
2011	45.47249
2012	46.03528
2013	46.36471
2014	46.3283
2015	46.37975
2016	46.56955
2017	46.73526
2018	46.8621