Year	% female
1971	24.92769
1972	25.37056
1974	27.35206
1984	35.77614
1991	42.93697
1992	45.24368
1993	46.34759
1994	45.58242
1995	44.19325
1996	42.96215
1999	40.25485
2000	39.99578
2001	39.7471
2002	38.31919
2003	36.39594
2004	36.32982
2005	37.26647
2006	38.47902
2007	39.96252
2008	41.86274
2009	43.44983
2010	44.86191
2011	46.31265
2012	46.90375
2015	48.45785