Year	% female
1971	32.08791
1972	33.99558
1973	36.39796
1974	41.15617
1975	42.6834
1976	47.76931
1977	45.99401
1978	46.94394
1979	47.29301
1980	49.05292
1981	48.29885
1982	48.32148
1983	48.70123
1984	49.41602
1985	49.93088
1986	50.10189
1987	52.6555
1988	49.89883
1989	50.08065
1990	50.60136
1991	50.15817
1992	49.97751
1993	49.59301
1994	49.12377
1995	48.95443
1996	48.7226
1998	49.44389
1999	49.42459
2000	49.10889
2001	50.09269
2002	49.71249
2003	49.45074
2004	48.85549
2005	49.39054
2006	49.16733
2007	49.61381
2008	48.87265
2009	48.8736
2010	49.05983
2011	48.80694
2012	49.02851
2013	48.99248
2014	48.0501
2015	48.35456
2016	48.97044
2017	49.03437
2018	48.94687