Year	% female
1970	28.77996
1971	29.00778
1972	27.51032
1973	28.64342
1974	30.3673
1975	31.33756
1976	34.31022
1977	33.98173
1978	34.00291
1979	34.89623
1981	34.87762
1982	34.70342
1983	35.2418
1985	37.19231
1986	38.42494
1987	39.52573
1988	40.94661
1989	42.2829
1991	43.00418
1992	43.50408
1993	43.59367
1994	44.09766
1995	44.4498
1996	45.84665
1997	44.35805
2010	44.76647
2014	48.76969
2015	49.47021
2016	49.86364
2017	50.25993
2018	50.82547