Year	% female
1970	30.38342
1971	30.19863
1972	30.15895
1973	31.4921
1974	31.37134
1975	30.79828
1976	30.69161
1977	30.23219
1978	30.14136
1979	30.33081
1980	30.11229
1981	30.8571
1982	32.93544
1983	30.86029
1984	28.26584
1985	30.84792
1986	33.14524
1987	34.99475
1988	36.33934
1989	37.25972
1990	36.98959
1991	36.71757
1992	36.84908
1993	36.3363
1994	34.98283
1995	34.81386
1996	34.85474
1997	34.71616
1998	34.85718
1999	34.82197
2000	35.26138
2001	35.34872
2002	35.69914
2003	35.90769
2004	36.51473
2005	36.81922
2006	37.99989
2007	38.37065
2008	38.45812
2009	38.41512
2010	37.85068
2011	37.83212
2012	38.29714
2013	39.04599
2014	40.03097
2015	41.31026
2016	41.4848
2017	41.08803
2018	40.89741