Year	% female
1970	37.91738
1971	38.1587
1972	38.23056
1973	37.91898
1974	37.80725
1975	37.32193
1976	37.28754
1977	37.16937
1978	36.99923
1979	37.03005
1980	37.38783
1981	38.15793
1982	38.91074
1983	39.11811
1984	39.29503
1985	39.32431
1986	39.49768
1987	39.5428
1988	39.70246
1989	39.78626
1990	39.83579
1991	39.78874
1992	39.87454
1993	39.81221
1994	39.28418
1995	40.54266
1996	40.4558
1997	40.48116
1998	40.23328
1999	40.17123
2000	40.22962
2001	40.15833
2002	40.38238
2003	40.96289
2004	40.72771
2005	41.22713
2006	41.32054
2007	41.80616
2008	42.2764
2009	42.64873
2010	43.42272
2011	44.05747
2012	44.50459
2013	44.80348
2014	44.92628
2015	45.18376
2016	45.35146
2017	45.49768
2018	45.61825