Year	% female
1970	31.43714
1971	31.43843
1972	32.29514
1973	32.99353
1974	33.69549
1975	33.93614
1976	34.6926
1977	35.3694
1978	35.91829
1979	36.45768
1980	36.80382
1981	37.53578
1982	38.1175
1983	38.71416
1984	39.15814
1985	39.58766
1986	39.91157
1987	40.21085
1988	40.58583
1989	41.00661
1990	41.651
1991	42.36957
1992	43.02337
1993	43.48666
1994	43.70373
1995	44.57646
1996	45.02221
1997	45.69719
1998	46.13448
1999	46.60024
2000	46.89471
2001	47.03358
2002	47.25905
2003	47.43696
2004	47.76595
2005	47.94832
2006	48.18755
2007	48.60965
2008	48.45517
2009	48.34985
2010	48.37399
2011	48.46407
2012	48.52206
2013	48.63934
2014	48.67628
2015	48.67754
2016	48.76268
2017	48.85109
2018	48.95031