Year	% female
1970	33.49172
1971	33.45315
1972	33.55964
1973	33.64128
1974	33.8753
1975	33.91714
1976	34.15028
1977	33.33135
1978	33.19331
1979	33.1875
1980	34.03907
1981	33.67217
1982	34.70337
1983	35.40994
1984	36.30412
1985	36.34039
1986	37.39792
1987	37.54355
1988	37.91564
1989	38.2805
1990	38.42115
1991	38.97365
1992	39.54899
1993	40.00665
1994	40.32739
1995	41.60439
1996	42.17542
1997	42.91114
1998	43.48422
1999	43.98823
2000	44.49495
2001	44.60855
2002	44.89845
2003	44.94796
2004	44.09028
2005	44.57332
2006	44.53309
2007	44.81827
2008	45.37142
2009	45.37276
2010	46.10431
2011	46.55463
2012	46.77807
2013	46.80746
2014	47.07256
2015	47.55419
2016	47.67432
2017	48.09919
2018	48.21193