Year	% female
1971	30.63594
1972	30.89389
1973	31.25483
1974	31.87609
1975	33.10738
1976	33.18438
1977	32.27766
1978	32.40566
1979	32.52948
1980	33.29241
1981	34.50033
1982	35.24528
1983	36.08541
1984	37.47036
1985	37.95316
1986	38.48074
1987	38.81942
1989	38.73875
1992	40.67516
1993	41.44887
1994	42.07033
1995	42.62679
1996	43.64444
1997	44.28937
1998	45.03027
1999	45.72961
2000	46.41691
2001	47.30057
2002	47.3116
2003	49.15286
2004	49.89132
2005	50.41223
2006	50.79191
2007	50.82465
2008	51.15353
2009	50.69848
2010	50.28535
2011	50.55822
2012	50.7165
2013	50.68312
2014	50.94779
2015	51.21583
2016	51.38358
2017	51.56172
2018	51.81304