Year	% female
1970	45.30275
1971	46.23306
1972	47.30766
1973	47.94455
1974	48.01643
1975	48.70315
1976	49.15434
1977	49.48698
1978	49.77843
1979	49.97499
1980	50.50206
1981	51.56204
1982	51.50299
1983	51.88289
1984	52.08726
1986	51.49864
1989	52.34655
1991	50.97341
1992	51.80569
1993	51.61266
1994	51.27715
1995	52.08611
1996	52.8719
1998	51.51182
1999	51.38437
2000	50.67622
2001	50.43775
2002	49.95769
2003	49.89005
2004	49.63467
2005	49.42529
2006	49.58449
2007	49.68214
2008	49.51667
2009	49.33153
2010	49.24117
2011	48.57976
2012	48.32874
2013	48.84685
2014	48.64821
2015	48.98287
2016	49.056
2017	49.31736
2018	49.21436