Year	% female
1971	30.41814
1972	30.03468
1973	30.76866
1974	31.25386
1975	33.19425
1976	29.33113
1977	28.36391
1978	27.81386
1979	26.95097
1980	26.91404
1981	26.15766
1983	27.76664
1984	28.01963
1985	28.68697
1986	28.00745
1987	28.07687
1990	27.87097
1995	29.40671
1996	29.77561
1997	30.194
2000	30.58142
2001	31.30111
2002	31.67446
2003	32.19213
2004	30.65296
2005	34.19752
2006	35.0287
2011	37.85533
2013	39.53987
2014	40.25885
2015	41.22348
2016	42.65804