Year	% female
1971	33.03201
1972	34.15469
1973	34.71527
1974	35.01448
1975	35.46757
1976	35.67687
1977	36.00814
1985	39.74307
1988	39.41076
1990	40.32699
1991	41.37513
1992	41.77463
1993	42.64708
1994	43.41536
1995	44.45586
1997	46.31798
1999	46.96922
2000	47.25102
2001	47.33926
2002	47.52036
2003	47.44187
2004	47.99222
2005	48.06215
2006	48.23681
2007	49.12674
2008	48.23144
2009	47.92787
2010	47.79023
2011	47.6717
2012	47.55135
2013	47.5784
2014	47.52331
2015	47.55864
2016	47.94755
2017	48.02918