Year	% female
1971	43.91935
1972	44.70091
1973	45.15545
1974	45.24661
1975	46.03964
1976	46.51975
1977	46.884
1978	47.62478
1979	47.83156
1980	47.94709
1981	48.23204
1982	48.34638
1983	48.59793
1984	48.34489
1985	48.58294
1986	48.56233
1987	47.31662
1988	48.5889
1989	48.02481
1990	48.03177
1991	47.47326
1992	48.0946
1993	47.98656
1994	47.98379
1995	45.73688
1996	48.08699
1997	47.00001
1998	46.99989
1999	48.76271
2000	47.77159
2001	48.24194
2002	48.29906
2003	48.17539
2004	48.13149
2005	47.91965
2006	47.24235
2007	47.98746
2008	47.97868
2009	47.97337
2010	48.32809
2011	48.28505
2012	51.5011