Year	% female
1970	30.71821
1971	30.73768
1972	31.66935
1973	32.32938
1974	32.95266
1975	33.27883
1976	34.07208
1977	34.81396
1978	35.36133
1979	35.97353
1980	36.40396
1981	37.04174
1982	37.63097
1983	38.23269
1984	38.68537
1985	39.15829
1986	39.43829
1987	39.71769
1988	40.04037
1989	40.42539
1990	41.19056
1991	41.86395
1992	42.50277
1993	43.01364
1994	43.34195
1995	44.12567
1996	44.54713
1997	45.10563
1998	45.59263
1999	46.07855
2000	46.35064
2001	46.4536
2002	46.60463
2003	46.79884
2004	46.95131
2005	47.15694
2006	47.35889
2007	47.74445
2008	47.4927
2009	47.42499
2010	47.41235
2011	47.43283
2012	47.36074
2013	47.30389
2014	47.39748
2015	47.37287
2016	47.4355
2017	47.44128
2018	47.52165