Year	% female
1970	59.87459
1972	59.87052
1973	59.64451
1974	59.61392
1975	59.03606
1976	58.93723
1977	59.19635
1978	59.3949
1979	59.06521
1980	58.59875
1981	57.88084
1982	57.04978
1983	56.52474
1984	55.92839
1985	55.63673
1986	55.49811
1987	55.52331
1988	55.33653
1989	54.99372
1990	54.72568
1991	54.74714
1992	54.08913
1993	53.50956
1994	52.92981
1995	52.53921
1996	52.35781
1997	51.90664
1998	51.78914
1999	51.67433
2000	50.63604
2001	50.20204
2002	50.07404
2003	50.02653
2004	49.70551
2005	49.63436
2006	49.60092
2007	49.43995
2008	49.41635
2009	49.58734
2010	49.08112
2011	48.8552
2012	48.95098
2013	49.10263
2014	49.02144
2015	48.91784
2016	48.90813
2017	48.8771