Year	% female
1970	38.78265
1971	38.97446
1972	39.85709
1974	40.88277
1975	40.1047
1976	41.15853
1977	41.36332
1978	41.56876
1979	42.19324
1980	42.88274
1981	42.64759
1982	42.59277
1983	43.46368
1984	43.52494
1985	44
1986	45.20252
1987	45
1988	44
1989	44.53011
1990	44.37247
1991	44.79066
1992	43.85025
1993	44.20002
1994	48.03732
1995	45.602
1996	46.30359
1997	46.59305
1998	47.26974
1999	47.49105
2000	48.23072
2001	48.87584
2002	49.4009
2003	49.26726
2004	49.39975
2005	49.57601
2006	49.84839
2007	49.86266
2008	49.93508
2009	49.98621
2010	50.09643
2011	50.11564
2012	50.07671
2013	50.12226
2015	50.1149
2016	50.38689
2017	50.28032