Year	% female
1970	40.83772
1971	40.86116
1972	40.89979
1973	40.94811
1974	41.20661
1975	41.40513
1976	41.40076
1977	41.50605
1978	41.91936
1979	42.33123
1980	42.08826
1981	41.82849
1982	41.73993
1983	42.15885
1984	41.84883
1985	41.59348
1986	42.37409
1987	42.7182
1988	42.88504
1989	43.11832
1990	43.21346
1991	43.40373
1992	43.63828
1993	43.80884
1994	44.28722
1995	44.58212
1996	44.8242
1997	45.13548
1998	45.55171
1999	45.92749
2000	46.04198
2001	46.11931
2002	46.27204
2003	46.65951
2004	46.66086
2005	46.85916
2006	46.96502
2007	47.07763
2008	47.24074
2009	47.50905
2010	47.33675
2011	47.40855
2012	47.48815
2013	47.7935
2014	47.88895
2015	47.86594
2016	47.91539
2017	47.86564
2018	47.88991