Year	% female
1971	45.67279
1972	47.59693
1973	48.57352
1974	50.80778
1975	52.34886
1976	54.1402
1977	54.67035
1978	54.80255
1979	55.42542
1980	56.17269
1981	57.15799
1982	55.95731
1983	54.54545
1984	54.36893
1985	54.86284
1986	57.3201
1987	54.30622
1988	54.2654
1989	53.76599
1990	53.88027
1991	54.30891
1992	53.29091
1993	46.97538
1994	47.91494
1995	48.402
1996	48.42392
1997	48.98335
1998	46.88148
1999	48.95858
2000	48.81919
2001	48.44834
2002	48.77436
2003	50.69145
2004	49.35958
2005	49.23076
2006	48.65535
2007	48.01863
2008	48.44408
2009	47.92457
2010	47.31164
2011	47.5374
2012	47.24226
2013	50.60889
2014	50.09187
2015	49.4041
2017	50.35037