Year	% female
1971	54.39074
1972	54.90767
1973	56.48551
1974	54.86777
1975	55.77001
1976	54.65477
1977	51.71954
1978	52.45157
1979	52.15582
1986	53.37231
1987	54.01918
1988	54.96266
1989	54.03819
1990	54.79588
1991	53.01689
1992	53.31645
1993	53.30157
2001	53.09022
2002	57.22671
2005	55.77066
2006	56.30177
2007	56.55129
2008	55.53247
2009	54.43764
2010	55.11323
2011	56.3162
2012	56.19643
2013	55.97306
2014	56.278
2015	55.17991