Year	% female
1971	42.37527
1972	43.28611
1973	44.55944
1974	45.90443
1975	46.71506
1976	47.84241
1977	47.70734
1978	48.34951
1979	49.30824
1980	49.86929
1981	50.52562
1982	50.97576
1983	51.47822
1984	51.30384
1985	51.47993
1986	51.33767
1987	51.38319
1988	51.09466
1996	49.58845
1998	49.85178
1999	49.96929
2000	49.95667
2001	49.65985
2002	49.64211
2003	49.72155
2004	49.78931
2005	49.65974
2006	49.42234
2007	49.28374
2008	49.20776
2009	49.15331
2010	48.94133
2011	48.80007
2012	48.79182
2013	48.24807
2014	48.12903
2015	48.16058
2016	48.16812
2017	48.22674
2018	48.27001