Year	% female
1971	26.53854
1972	28.64094
1973	32.44632
1977	32.73131
1978	34.36389
1979	35.79811
1980	38.2217
1981	38.60563
1986	40.91349
1988	40.84435
1990	39.90413
1992	38.95244
1993	38.03203
1994	38.63329
1995	39.15078
1996	39.31322
1997	39.41299
1998	40.14375
1999	40.29642
2000	40.54296
2001	40.98527
2002	41.41191
2003	41.85453
2004	42.22547
2005	42.46882
2006	43.04521
2007	43.35728
2008	43.86541
2009	44.2774
2010	44.67941
2011	45.20671
2012	45.80611
2013	46.30231
2014	46.9577
2015	47.27747
2016	47.34442
2017	47.4067
2018	47.56735