Year	% female
1970	30.95477
1971	30.82968
1972	30.89397
1973	31.00112
1974	31.23084
1975	31.22893
1976	31.48857
1977	30.27028
1978	30.03493
1979	30.02756
1980	31.13716
1981	30.64547
1982	31.9885
1983	32.97424
1984	34.09698
1985	34.06412
1986	35.16182
1987	35.29534
1988	35.85503
1989	36.38079
1990	36.47373
1991	37.17768
1992	37.91949
1993	38.46565
1994	38.8315
1995	40.31872
1996	41.01231
1997	41.73846
1998	42.48841
1999	43.07266
2000	43.70084
2001	43.8638
2002	44.22877
2003	44.1944
2004	43.25357
2005	43.82181
2006	43.79952
2007	44.02934
2008	44.58869
2009	44.60163
2010	45.31352
2011	45.87464
2012	46.10697
2013	46.17752
2014	46.41229
2015	46.88693
2016	46.97849
2017	47.40514
2018	47.44486