Year	% female
1970	32.08985
1971	32.43938
1972	32.50742
1973	33.83832
1974	34.51139
1975	34.86188
1976	35.04465
1977	34.34032
1978	34.23682
1979	33.75867
1980	34.91597
1981	35.19725
1982	36.03609
1983	35.66853
1984	36.38437
1985	37.85221
1986	37.6767
1987	38.19575
1988	38.21002
1989	38.14693
1990	38.29785
1991	38.5884
1992	39.10568
1993	38.76283
1994	37.3135
1995	37.27744
1996	37.3695
1997	37.18084
1998	37.48354
1999	37.53765
2000	39.5676
2001	39.90636
2002	40.53513
2003	40.92661
2004	41.68522
2005	42.06158
2006	42.9601
2007	42.90474
2008	42.82277
2009	42.69514
2010	42.14443
2011	42.0235
2012	42.02941
2013	42.08825
2014	42.11701
2015	42.91897
2016	42.7093
2017	42.59181
2018	42.39084