Year	% female
1970	3.36134
1971	7.39437
1972	7.5543
1974	9.67562
1977	15.625
1983	17.04417
1984	17.47275
1998	42.85481
1999	43.31613
2000	43.83345
2001	44.49596
2005	47.14787
2006	47.70002
2007	47.9729
2008	48.16692
2009	49.47739
2010	49.88007
2011	50.40626
2012	50.71286
2013	50.97928
2014	50.98684
2015	50.85307
2016	51.54652
2017	51.66481
2018	52.01454