Year	% female
1970	36.24649
1971	36.28215
1972	36.55105
1973	36.81691
1974	36.63448
1975	36.76023
1976	36.97058
1977	37.28237
1978	37.23299
1979	37.61849
1980	37.77982
1981	38.23783
1982	38.48782
1983	38.32852
1984	38.72383
1985	39.13955
1986	39.73614
1987	40.00551
1988	40.53118
1989	40.14603
1990	40.56484
1991	41.22006
1992	41.52793
1993	42.29934
1994	42.59504
1995	42.6888
1996	42.93376
1997	43.15013
1998	43.29874
1999	43.40101
2000	43.53812
2001	43.73743
2002	44.0791
2003	46.24622
2004	46.10308
2005	46.41209
2006	46.58468
2007	46.74221
2008	47.25678
2009	47.51667
2010	47.48296
2011	47.69336
2012	47.8021
2013	49.17337
2014	49.05704
2015	49.15078
2016	49.92541
2017	49.76301
2018	49.65607