Year	% female
1970	37.70795
1971	37.75862
1972	40.22989
1973	41.1976
1974	40.64961
1975	43.94299
1976	42.43243
1977	43.21608
1978	43.25872
1979	42.82755
1980	43.95939
1981	43.44132
1983	42.086
1989	44.11093
1991	43.2219
1992	44.36636
1999	45.643
2000	54.10256
2001	48.98239
2002	49.76067
2003	49.37746
2004	49.34378
2005	49.67726
2006	49.16353
2008	49.39046
2009	50.48946
2010	49.82767
2013	49.79819
2015	48.89874