Year	% female
1970	37.09998
1971	38.90509
1972	37.36805
1973	37.6021
1974	38.99999
1975	40.17922
1976	40.49705
1977	40.93739
1978	41.28732
1981	40.77911
1982	40.80522
1983	42.22321
1984	41.94889
1985	42.23755
1988	44.13457
1989	44.70038
1990	45.05003
1991	45.38672
1992	45.44938
1993	44.76075
1994	45.943
1995	45.90937
1996	46.0964
1999	48.97775
2001	49.61616
2002	49.90974
2003	49.84946
2004	49.96591
2005	49.98712
2006	50.47041
2007	50.51358
2008	50.36809
2009	50.50236
2010	50.80133
2011	50.70361
2012	51.33164
2013	50.47971
2014	50.6962
2015	50.0869
2016	50.8947
2017	50.71624
2018	50.7191