Year	% female
1970	29.70555
1971	29.7528
1972	30.52508
1973	30.55038
1974	30.49002
1975	31.15224
1976	31.94179
1977	33.05626
1978	33.2202
1979	34.28948
1980	35.28131
1981	35.07439
1982	35.61826
1983	36.13992
1984	36.50767
1985	37.21155
1986	37.16613
1987	37.27777
1988	37.12118
1989	37.13518
1990	38.34743
1991	38.57462
1992	38.92171
1993	40.14335
1994	41.36314
1995	41.33395
1996	41.55737
1997	41.37841
1998	42.30384
1999	42.95567
2000	43.2256
2001	43.2428
2002	42.87753
2003	43.16329
2004	42.33343
2005	42.45888
2006	42.17528
2007	41.69515
2008	40.48091
2009	40.12989
2010	39.89133
2011	39.81678
2012	38.94983
2013	38.52812
2014	38.82144
2015	38.57105
2016	38.55785
2017	38.06126
2018	38.15457