Year	% female
1970	18.04916
1972	44.62713
1973	40.42216
1974	44.88969
1975	49.73716
1976	60.32986
1977	53.32507
1978	62.17066
1980	57.41913
1981	57.07052
1983	57.27209
1984	46.548
1985	48.27202
1986	51.26149
1987	49.27928
1991	30.19025
1992	25.89809
1998	22.57903
1999	28.57143
2000	40.21222
2001	37.47841
2002	28.57682
2003	33.76455
2004	28.48592
2006	33.87242
2007	34.40447
2008	31.27425
2009	31.33641
2011	24.16008
2012	18.93449