Year	% female
1971	39.79253
1972	40.90421
1974	41.62178
1988	45.6509
1989	48.11411
1990	48.51256
2005	48.95078
2006	48.73727
2007	48.80358
2008	48.59534
2009	48.51036
2011	48.78148
2012	48.87268
2014	49.52351
2015	49.70281
2016	49.80853
2017	50.21101
2018	50.60593