Year	% female
1970	31.32888
1971	31.07719
1972	31.68201
1973	31.63425
1974	31.34306
1975	31.80549
1976	32.46467
1977	33.3333
1978	33.41831
1979	34.4113
1980	35.31384
1981	35.13855
1982	35.5644
1983	35.94412
1984	36.24004
1985	36.82817
1986	36.79253
1987	36.88865
1988	36.70261
1989	36.6877
1990	37.8275
1991	37.99821
1992	38.26563
1993	39.43283
1994	40.62989
1995	40.53531
1996	40.67394
1997	40.53394
1998	41.43769
1999	41.90064
2000	42.36527
2001	42.4208
2002	42.10677
2003	42.42753
2004	41.69323
2005	41.79571
2006	41.42187
2007	40.89385
2008	39.52095
2009	38.90071
2010	38.66167
2011	38.77129
2012	38.10223
2013	37.84386
2014	38.13435
2015	38.0003
2016	38.04263
2017	37.60738
2018	37.70573