Year	% female
1971	26.8966
1972	28.56194
1973	28.33772
1974	27.91169
1975	29.47792
1976	25.77048
1977	27.18894
1978	29.29653
1979	29.49444
1980	28.60174
1981	28.68599
1982	28.70071
1984	26.85595
1985	28.36743
1986	30.00927
1987	30.9176
1988	31.19618
1989	30.91106
1990	31.01851
1991	31.11894
1992	31.84275
1993	28.10056
1994	34.16794
1995	34.40255
1996	34.62874
1997	36.01402
1999	41.09517
2000	40.51796
2001	43.90088
2002	42.85704
2003	43.42601
2004	41.24804
2005	40.74576
2006	37.02581
2007	34.37899
2008	33.62567
2009	34.46069
2010	33.95447
2011	34.29678