Year	% female
1970	45.88931
1973	46.44667
1977	47.77452
1978	48.12321
1979	47.62912
1980	47.9102
1981	48.12607
1982	47.59176
1985	48.15303
1991	48.57999
1992	48.55028
1993	48.5817
1995	48.58169
1998	48.88353
1999	49.01018
2000	49.03409
2001	49.09707
2002	49.08294
2003	49.02048
2004	49.0366
2005	49.06016
2006	49.00423
2007	49.01415
2008	49.05273
2009	49.01335
2010	49.0601
2011	48.91162
2012	48.76558
2013	48.86182
2014	48.95214
2015	48.97068
2016	49.07341
2017	49.06396
2018	49.10449