Year	% female
1970	36.40339
1971	34.3581
1972	37.76691
1973	37.7604
1974	39.02561
1975	38.07009
1976	38.88827
1977	40.63282
1978	39.87065
1979	40.53683
1980	41.49636
1981	41.57864
1982	42.19036
1983	42.70878
1986	43.52299
1990	44.3443
1991	44.40408
1992	44.22543
1993	44.3612
1994	44.78039
1999	46.26827
2000	46.06025
2002	46.4997
2005	46.75688
2006	47.07312
2007	47.07204
2010	47.62055
2011	47.66586
2012	47.89691
2013	48.16499
2014	47.7285
2015	48.14172
2016	48.09007
2017	48.20104
2018	48.28793