Year	% female
1970	28.24236
1971	28.46754
1972	29.36148
1973	30.19249
1974	31.1351
1975	30.48018
1976	30.33248
1977	29.12465
1978	28.52739
1979	28.13257
1980	28.79749
1981	29.0501
1982	30.0187
1983	30.34763
1984	30.98513
1985	31.59689
1986	31.2413
1987	31.7581
1988	32.36667
1989	32.68826
1990	32.75837
1991	32.77869
1992	33.19896
1993	33.05641
1994	31.79646
1995	31.84956
1996	31.96731
1997	31.11427
1998	31.88474
1999	32.29056
2000	33.61618
2001	33.81108
2002	34.58023
2003	35.02063
2004	35.84828
2005	36.52522
2006	37.01771
2007	37.03893
2008	37.07314
2009	37.54116
2010	35.97436
2011	36.89437
2012	37.31486
2013	37.87721
2014	37.74696
2015	37.75584
2016	37.92618
2017	37.95659
2018	37.51576