Year	% female
1970	34.70825
1971	34.95635
1972	33.96039
1973	33.12646
1974	33.62114
1975	34.66342
1976	33.5561
1977	28.91082
1978	28.56364
1979	27.09851
1980	26.1315
1981	28.59233
1982	26.60007
1983	26.98989
1984	27.47972
1985	28.13282
1986	27.76964
1987	26.4425
1988	27.58155
1989	30.42689
1990	26.40542
1991	21.95567
1992	18.18389
1993	14.40307
1994	14.80088
1995	15.74979
1996	17.14592
1997	17.26933
1998	19.37559
1999	21.39497
2000	22.09578
2001	20.25897
2002	20.64615
2003	19.12843
2004	22.02491
2005	24.6131
2006	27.615
2007	28.68973
2008	28.80538
2009	29.59033
2010	27.49761
2011	27.73513
2012	26.69665
2013	25.33731
2014	24.62515
2015	21.90829
2016	21.9755
2017	21.37087
2018	21.91623