Year	% female
1970	45.05697
1971	44.7333
1972	45.308
1973	46.16024
1974	48.24059
1975	49.45048
1976	49.85189
1977	51.56869
1978	50.03617
1979	50.69557
1980	51.13815
1981	54.33219
1982	54.97797
1983	55.31798
1984	54.83405
1985	54.74138
1986	54.77298
1987	54.34894
1988	54.30833
1989	53.38161
1992	53.56295
1993	54.55371
1994	54.42404
1995	53.98358
1996	54.57073
1997	54.78178
1998	54.81001
1999	50.75602
2000	50.89193
2001	51.26148
2002	51.39274
2003	51.45522
2004	51.10114
2005	51.2535
2006	50.91138
2007	50.77752
2008	50.41749
2010	50.40952
2011	50.36082
2012	50.267
2013	50.06004
2014	49.9656
2015	50.17641
2016	49.81188
2017	49.47113