Year	% female
1971	41.75502
1973	42.05413
1974	42.1124
1975	42.71317
1976	43.82885
1977	44.58329
1978	45.24946
1990	50.27794
1991	48.28257
1992	48.43427
1993	48.70455
2001	48.54675
2002	49.24582
2004	50.90709
2005	50.50046
2006	50.79548
2007	51.08974
2008	50.98435
2009	51.0531
2010	50.82827
2011	50.79717
2012	50.67976
2013	51.08401
2014	50.14043
2015	47.78832
2016	48.63439
2017	47.73833
2018	48.19721