Year	% female
1970	42.09523
1971	42.87264
1972	41.77992
1975	49.68606
1977	50.29996
1978	49.69999
1979	50.29999
1980	50.30464
1981	50.02522
1982	50.02524
1983	50.69253
1984	49.89995
1985	49.79877
1986	49.85718
1987	49.89895
1988	49.84771
1989	49.92742
1991	51.15629
1996	48.43091
2001	51.5785
2002	51.31025
2004	51.34348
2005	51.37019
2006	51.6084
2007	51.50539
2008	51.28714
2009	51.24247
2010	51.1151
2011	50.9685
2012	50.9278
2013	50.7586
2014	50.68343
2015	50.47237
2016	50.28838
2017	50.07298
2018	49.97378