Year	% female
1970	25.57143
1971	27.03488
1975	24.97517
1986	37.5359
1990	36.69269
1991	35.65928
1992	36.63366
1993	36.15835
1994	37.63923
1999	41.05333
2000	42.11577
2001	42.9915
2002	42.88018
2005	43.49624
2006	43.46176
2007	43.51676
2010	44.53231
2011	45.86781
2012	46.74268