Year	% female
1970	38.79389
1971	39.73424
1973	41.77664
1974	40.75555
1980	43.22888
1981	44.20046
1983	44.12409
1984	44.55429
1986	45.08738
1987	44.58548
1989	45.81725
1990	45.45243
1998	46.82601
1999	46.85438
2000	47.25601
2001	47.46703
2002	47.57633
2003	47.31838
2004	47.4693
2005	47.83811
2006	48.00016
2007	48.18232
2008	48.29974
2009	48.37778
2010	48.35367
2011	48.44313
2012	48.31097
2013	48.03345
2014	47.86843
2015	47.82905
2016	47.54702
2017	47.4674
2018	47.48791