Year	% female
1970	35.20685
1971	35.26572
1972	35.50389
1973	35.84551
1974	36.03116
1975	36.09084
1976	36.21321
1977	35.76456
1978	35.78593
1979	35.99069
1980	36.17857
1981	36.08974
1982	36.6542
1983	36.16973
1984	36.22287
1985	37.27157
1986	38.97344
1987	39.25219
1988	39.43148
1989	39.55382
1990	39.65203
1991	40.12829
1992	40.48897
1993	40.89597
1994	41.23283
1995	42.14033
1996	42.6558
1997	43.27412
1998	43.72996
1999	44.23807
2000	44.48113
2001	44.62579
2002	44.61941
2003	44.97174
2004	44.40461
2005	44.88971
2006	44.81228
2007	44.72014
2008	45.30381
2009	45.52231
2010	45.89444
2011	46.00835
2012	46.24345
2013	46.23046
2014	46.516
2015	46.8954
2016	46.99645
2017	47.29894
2018	47.51872