Year	% female
1971	49.67597
1972	48.39162
1973	47.62054
1974	47.23381
1975	48.12003
1976	50.34527
1977	50.16543
1978	50.26826
1979	50.37624
1980	50.15308
1987	50.37207
1988	50.38851
1989	50.38867
1990	50.41591
1998	50.2414
2008	47.82188
2009	47.79141
2010	47.75405
2011	47.73359
2012	47.71105
2013	48.01033
2014	48.17537
2015	48.2817
2016	48.24317
2017	48.26643
2018	48.29377