Year	% female
1972	54.75207
1973	54.8268
1974	56.64173
1975	57.97656
1976	56.21373
1977	57.26557
1978	58.18429
1980	56.67145
1981	55.73618
1982	56.5983
1983	55.51987
1984	57.20585
1985	57.46229
1986	57.57333
1987	57.27853
1988	53.56074
1990	58.37462
1991	57.84646
1992	58.65156
1993	59.79058
1999	56.47843
2000	57.23863
2001	56.47668
2002	56.93322
2003	56.13647
2004	50.69859
2005	55.14798
2006	54.59561
2007	52.90674
2008	51.1538
2009	50.76827
2010	49.66958
2011	49.45304
2012	49.95537
2013	50.34508
2014	50.10047
2015	50.16104
2016	50.53463
2017	50.37706
2018	50.14157