Year	% female
1971	50.54625
1972	49.58723
1973	49.32444
1974	49.65293
1976	50.50121
1984	50.08759
1985	50.20995
1986	51.32731
1987	50.89854
1999	50.32491
2001	50.30683
2005	49.98655
2007	48.76662
2008	50.27654
2009	49.85823
2010	50.64951
2011	50.34088
2012	49.99185