Year	% female
1970	41.97775
1971	42.11572
1972	42.09
1973	42.38075
1974	42.84149
1975	43.29341
1976	43.37881
1977	43.57988
1978	44.00091
1979	44.15017
1980	44.04401
1981	43.77503
1982	43.74875
1983	44.02051
1984	43.73832
1985	43.62039
1986	44.12837
1987	44.28033
1988	44.36516
1989	44.52298
1990	44.68167
1991	44.86806
1992	45.06914
1993	45.19121
1994	45.44106
1995	45.68916
1996	45.82285
1997	46.12096
1998	46.51134
1999	46.77488
2000	46.81782
2001	46.88044
2002	46.99467
2003	47.32648
2004	47.3559
2005	47.44829
2006	47.47343
2007	47.57883
2008	47.71968
2009	47.98745
2010	48.02286
2011	48.08363
2012	48.15862
2013	48.48679
2014	48.55483
2015	48.49577
2016	48.53036
2017	48.55312
2018	48.60941