Year	% female
1970	43.56483
1971	44.32718
1972	43.62243
1973	43.82427
1974	44.75408
1975	45.70396
1976	46.68122
1977	47.76844
1998	50.30413
1999	50.08042
2000	50.20497
2001	50.20461
2002	50.44993
2003	50.18163
2004	49.06494
2005	49.95491
2006	50.07859
2007	47.08155
2009	49.8634
2010	49.61577
2011	48.97522
2012	48.83696
2013	49.28901
2014	49.58809
2015	49.77213
2016	49.54566