Year	% female
1970	31.22155
1971	31.49289
1972	31.77399
1973	32.42106
1974	32.8248
1975	32.99815
1976	33.03869
1977	32.03973
1978	31.72933
1979	31.42144
1980	32.49217
1981	32.94356
1982	33.48363
1983	33.52787
1984	34.13928
1985	35.27752
1986	34.70647
1987	34.99203
1988	35.38811
1989	35.52431
1990	36.01355
1991	36.26978
1992	36.49598
1993	36.41754
1994	35.19217
1995	35.21812
1996	35.47284
1997	34.65319
1998	35.5264
1999	35.88455
2000	36.48941
2001	36.61111
2002	36.83187
2003	37.08704
2004	37.79414
2005	38.23522
2006	39.06576
2007	38.99737
2008	39.17875
2009	39.48214
2010	38.06123
2011	39.25857
2012	39.25523
2013	39.24744
2014	38.82255
2015	39.06265
2016	38.84827
2017	38.74249
2018	38.22685