Year	% female
1971	42.86669
1972	42.41635
1973	43.46115
1974	43.66769
1976	46.65645
1977	46.29248
1978	46.35419
1979	46.37687
1980	47.16493
1981	47.061
1982	47.23609
1983	47.89373
1984	50.80105
1985	51.3361
1986	51.65494
1987	52.12194
1988	52.85852
1989	52.66094
1990	54.07147
1991	54.96546
1992	55.22591
1993	54.37884
1994	53.06072
1995	51.72396
1996	53.84678
1997	51.22234
1998	48.71301
1999	47.8764
2000	48.37832
2001	49.33253
2002	49.49787
2003	49.57073
2004	46.00403
2005	46.19552
2006	46.20288
2007	46.28737
2008	46.54477
2009	46.5329
2010	46.66256
2011	46.8011
2012	46.97146
2013	50.54066
2014	50.74706
2015	50.63081
2016	50.54046
2017	50.46778