Year	% female
1970	50.02268
1971	51.06608
1972	53.24521
1973	53.38327
1974	53.16486
1975	48.89736
1976	52.81264
1977	52.45232
1978	53.70405
1979	54.44352
1980	54.35555
1981	54.83166
1982	54.46379
1983	54.92004
1984	54.11047
1985	53.48422
1986	53.98518
1987	53.6913
1988	53.6655
1989	53.8426
1990	54.33639
1991	54.8801
1992	53.78076
1993	54.12939
1994	54.43348
1995	54.35082
1996	54.0156
1997	54.16078
1998	54.04059
1999	54.66911
2000	53.56749
2001	53.18236
2002	52.89834
2003	56.22975
2004	52.48188
2005	52.58132
2006	53.04312
2007	53.6145
2008	53.57426
2009	53.76492
2010	53.73488
2011	53.63864
2012	53.57646
2013	52.13571
2014	52.11347
2015	52.46482
2016	52.619
2017	52.17729
2018	52.19136