Year	% female
1971	41.831
1972	42.63629
1973	43.74827
1974	44.89598
1975	45.66874
1976	46.76595
1977	46.61406
1978	47.16586
1979	48.12389
1980	48.63993
1981	49.30711
1982	49.77878
1983	50.18896
1984	50.06518
1985	49.6321
1986	49.50496
1987	49.48611
1988	49.13381
1996	49.07063
2001	48.46329
2002	48.51485
2003	48.79848
2004	48.89717
2005	48.9357
2006	48.82446
2007	48.76872
2008	48.71766
2009	48.70515
2010	48.52726
2011	48.41758
2012	48.34703
2013	47.79079
2014	47.53024
2015	47.4898
2016	47.50336
2017	47.49747
2018	47.56879