Year	% female
1970	46.8886
1971	47.8903
1972	47.07045
1973	49.76606
1974	51.86263
1975	52.83518
1976	53.95611
1977	54.98838
1978	55.83116
1979	55.78394
1980	56.1146
1981	55.76732
1982	54.95826
1983	54.48948
1984	54.12951
1985	53.38493
1986	52.54963
1987	51.69016
1988	50.85611
1989	52.22704
1990	53.31154
1991	54.06378
1992	53.67786
1993	53.45852
1994	52.71446
1995	53.26438
1996	53.2287
1998	52.84349
1999	52.46398
2000	52.0259
2001	51.93781
2002	52.08141
2003	52.00337
2004	51.89783
2005	51.81625
2006	51.97106
2007	51.90168
2008	51.90168
2009	51.94609
2012	51.68444
2013	51.65139
2014	50.3176
2015	51.54317