Year	% female
1970	32.04249
1971	31.8395
1972	34.61928
1973	34.61586
1974	33.0615
1975	34.00093
1976	34.3019
1977	36.95351
1978	36.95299
1979	36.95299
1980	36.95299
1981	40.27355
1982	40.67857
1983	36.94878
1984	40.2236
1985	39.99999
1986	39.91235
1987	39.91235
1988	43.60728
1989	43.80083
1990	44.77998
2005	50.12349
2006	50.35432
2007	50.74236
2008	50.50598
2009	50.17339
2010	50.50598
2017	50.6819
2018	50.7497