Year	% female
1970	40.73604
1971	40.49625
1972	41.58301
1973	42.59063
1974	43.49992
1975	44.06876
1976	45.1437
1979	47.28995
1980	47.92862
1981	48.41047
1982	48.80337
1983	48.91294
1984	49.27823
1985	49.43874
1986	49.02652
1987	49.8022
1988	50.16878
1989	50.47787
1990	50.8916
1991	50.55991
1992	51.13343
1993	51.47801
1994	51.6464
1995	51.96112
1996	52.1469
1998	52.03154
1999	51.45832
2000	51.79928
2001	51.58054
2002	51.82933
2003	52.54569
2004	52.4557
2005	51.75619
2006	51.35469
2007	51.11233
2008	51.18676
2009	51.07603
2010	51.02222
2011	51.22263
2012	50.92872
2013	51.28684
2014	51.50254
2015	51.91942
2016	50.56833
2017	50.92863
2018	51.27877