Year	% female
1970	27.71216
1971	27.68221
1972	27.5659
1973	29.44714
1974	29.99717
1975	29.18854
1976	29.4201
1977	29.04534
1978	29.33825
1979	29.46491
1980	29.4863
1981	30.4735
1982	32.88787
1983	30.86925
1984	28.24534
1985	30.6698
1986	32.47549
1987	34.38798
1988	35.73028
1989	36.6184
1990	36.30704
1991	35.96011
1992	35.88073
1993	35.43889
1994	33.97479
1995	33.61769
1996	33.45998
1997	32.96253
1998	32.79276
1999	32.84106
2000	33.64858
2001	33.76464
2002	34.19297
2003	34.59434
2004	34.98454
2005	34.87377
2006	35.34439
2007	35.86355
2008	35.3929
2009	35.64113
2010	34.90767
2011	34.4771
2012	35.05141
2013	35.67442
2014	36.50177
2015	37.76377
2016	37.79909
2017	37.87201
2018	37.67391