Year	% female
1970	35.04117
1971	34.85726
1972	34.73888
1973	35.1183
1974	35.53422
1975	35.48813
1976	35.64458
1977	35.68284
1978	35.6427
1979	35.61593
1980	35.82305
1981	36.35798
1982	37.26205
1983	37.6975
1984	37.9155
1985	38.2348
1986	38.54411
1987	39.02718
1988	39.45104
1989	39.75149
1990	39.96453
1991	40.01001
1992	40.16647
1993	40.12175
1994	39.53224
1995	40.78294
1996	40.77986
1997	40.76455
1998	40.76057
1999	40.75021
2000	41.07189
2001	40.53721
2002	41.2358
2003	41.89242
2004	41.58173
2005	42.13521
2006	42.17491
2007	42.46439
2008	42.51292
2009	42.59494
2010	42.8611
2011	43.18306
2012	43.32706
2013	43.46753
2014	43.30865
2015	43.81298
2016	44.07258
2017	44.18438
2018	44.22324