Year	% female
1970	40.17081
1971	40.2807
1972	39.94134
1973	39.67575
1974	39.97878
1975	39.34998
1976	40.06056
1977	40.16508
1978	41.00331
1979	42.01435
1980	43.30197
1981	43.19748
1982	42.08854
1983	41.27152
1984	41.09227
1985	41.34369
1986	41.56877
1987	41.23451
1988	41.82455
1989	41.85124
1990	41.92477
1991	41.20341
1992	41.10542
1993	40.49836
1994	41.40728
1995	40.75148
1996	39.50911
1997	39.58993
1998	38.38571
1999	37.97151
2000	38.03192
2001	38.29202
2002	39.52977
2003	39.0652
2004	38.55028
2005	38.60857
2006	38.79171
2007	38.77718
2008	39.32362
2009	39.12227
2010	39.24418
2011	40.45185
2012	40.54735
2013	39.33025
2014	38.91713
2015	38.72353
2016	39.02345
2017	39.76457
2018	39.76803