Year	% female
1970	41.66326
1971	41.63574
1972	41.59291
1973	41.58466
1974	41.89674
1975	42.19303
1976	41.98557
1977	42.12605
1978	42.5548
1979	42.86475
1980	42.61643
1981	42.2879
1982	42.08998
1983	42.68798
1984	42.34873
1985	42.07052
1986	42.72818
1987	42.9928
1988	43.19272
1989	43.45525
1990	43.73556
1991	43.98332
1992	44.30597
1993	44.47131
1994	44.83687
1995	45.05132
1996	45.23689
1997	45.61327
1998	46.01844
1999	46.37654
2000	46.49449
2001	46.58222
2002	46.82324
2003	47.2387
2004	47.33276
2005	47.39537
2006	47.52463
2007	47.69656
2008	47.82522
2009	48.16856
2010	48.18189
2011	48.28487
2012	48.35924
2013	48.87456
2014	48.88625
2015	48.71508
2016	48.77964
2017	48.74524
2018	48.77774