Year	% female
1971	27.33564
1972	49.11717
1987	36.51772
1988	38.18722
1989	40.73034
1990	39.76064
1994	39.01267
2001	38.51992
2002	40.02809
2003	39.43966
2004	39.45875
2005	41.15818
2006	42.30216
2007	42.66169
2008	43.57367
2009	46.03081
2010	48.49517
2011	48.53801
2012	47.95673
2013	45.67493
2014	41.78843
2015	41.86618
2016	42.56378
2017	40.74324
2018	39.10891