Year	% female
1970	38.47087
1971	37.83482
1972	37.58099
1973	38.6037
1974	40.85308
1975	37.27273
1977	40.69231
1978	45.86877
1979	47.23569
1980	45.57377
1981	48.36842
1982	49.20886
1983	49.18464
1984	47.63742
1985	50.04554
1986	49.43625
1987	49.09747
1988	49.32718
1989	45.50465
1990	48.71795
1991	51.72414
1992	51.59368
1995	54.44358
1996	53.83552
1998	51.60707
1999	54.35535
2000	55.00935
2001	53.15689
2002	52.49661
2003	52.91066
2004	52.83654
2005	51.8226
2006	52.81086
2007	52.65713
2008	51.20435