Year	% female
1970	54.30623
1971	49.84657
1972	45.6227
1973	41.84423
1974	44.3783
1975	44.87642
1976	45.17837
1977	46.73431
1978	47.0895
1979	48.60184
1980	50.24205
1981	53.24696
1982	53.04668
1983	53.29959
1984	54.84845
1987	54.43983
1988	55.35001
1989	51.15578
1991	56.80313
1992	54.68136
1993	53.52982
1998	50.29283
2000	51.97754
2001	52.05854
2002	52.08828
2003	52.15491
2004	52.19411
2005	52.63343
2006	53.14476
2007	53.20501
2008	52.84855
2009	52.33984
2010	51.7735
2011	51.33092
2012	51.35517
2013	51.6371
2014	51.2969
2015	50.9605
2016	50.73973
2017	50.21655
2018	49.59903