Year	% female
1973	57.85832
1974	61.77277
1975	62.65872
1976	58.9795
1977	60.32842
1978	59.41343
1979	59.18277
1986	53.63636
1987	53.89981
1990	53.30138
1999	56.5675
2000	52.83349
2001	52.17275
2002	52.14667
2003	51.67012
2004	50.42129
2005	50.01338
2006	49.67224
2007	49.99332
2008	49.04912
2009	50.8733
2010	50.62075
2011	50.48409
2014	49.01995
2015	49.16382