Year	% female
1971	26.00606
1972	26.94324
1973	27.72087
1974	28.85111
1975	30.21009
1976	31.13374
1977	32.47701
1978	33.43239
1979	34.53416
1980	35.86696
1981	36.55951
1982	36.98877
1983	37.60399
1984	38.19202
1985	39.11806
1986	39.80627
1987	39.99081
1988	40.49532
1989	40.58657
1990	41.23073
1991	41.48329
1992	42.34116
1993	43.59703
1994	43.83357
1995	44.44784
1996	45.61338
1997	46.33535
1998	46.37064
1999	46.8441
2000	46.88702
2001	46.42143
2002	46.56646
2003	47.11661
2004	47.23327
2005	47.35528
2006	47.6666
2007	48.2
2008	48.46609
2009	48.68359
2010	48.67907
2011	48.5876
2012	48.66474
2013	48.5608