Year	% female
1972	50.0144
1974	40.38462
1975	45.63953
1976	47.25926
1977	31.73077
1978	36.76255
1979	33.67112
1980	43.1955
1981	42.70033
1982	40.67686
1984	43.32046
1985	42.37288
1986	44.74803
1987	46.99562
1988	49.23345
1989	49.76533
1990	51.50408
1994	50.70291
2001	51.71419
2002	51.27705
2003	52.45668
2004	52.79269
2005	53.04403
2006	53.89188
2007	54.48416
2008	52.66369
2009	54.36096
2010	54.36778
2011	54.02565
2012	54.09341
2013	53.36794
2014	53.02691
2015	52.51981
2016	52.31189
2017	52.33047
2018	52.52862