Year	% female
1970	65.68703
1971	65.28376
1972	70.34446
1975	50.46945
1977	48.85689
1978	51.11228
1979	49.47548
1980	49.92384
1981	51.40163
1982	51.40066
1983	61.63114
1984	49.90006
1985	50.21952
1986	50.38248
1987	49.90325
1988	50.06441
1989	49.81434
1991	60.90068
1996	55.52214
2002	54.87825
2004	55.24889
2005	54.33307
2006	54.06767
2007	54.58633
2008	53.60311
2009	54.24789
2010	54.28057
2011	54.47837
2012	54.32539
2013	53.76103
2014	53.67762
2015	53.57311
2016	53.58631
2017	53.46824
2018	53.25101