Year	% female
1970	36.38852
1971	36.16297
1972	36.01383
1973	36.01873
1974	36.102
1975	35.67123
1976	35.42223
1977	35.40818
1978	35.36082
1979	35.33716
1980	35.71432
1981	36.01294
1982	36.99568
1983	37.2686
1984	37.58173
1985	37.89073
1986	38.43188
1987	38.913
1988	39.18792
1989	39.53575
1990	39.78937
1991	40.06723
1992	40.14161
1993	40.04544
1994	39.51858
1995	40.78286
1996	40.71382
1997	40.68605
1998	40.58395
1999	40.75966
2000	40.62987
2001	40.67833
2002	40.74023
2003	41.14939
2004	40.64627
2005	41.03521
2006	41.00695
2007	41.44312
2008	41.86819
2009	42.33606
2010	42.98164
2011	43.73515
2012	44.16052
2013	44.67295
2014	44.85858
2015	45.25527
2016	45.48094
2017	45.67668
2018	45.89096